WO2021038535A1

WO2021038535A1 - Dual-purpose hood

Info

Publication number: WO2021038535A1
Application number: PCT/IB2020/058086
Authority: WO
Inventors: Hamideh HATAMIHENZA; Romina ASGHARI; Fatemeh SABBAGHIAN
Original assignee: Hatamihenza Hamideh; Asghari Romina
Priority date: 2019-08-30
Filing date: 2020-08-30
Publication date: 2021-03-04

Abstract

A dual-purpose hood comprises a cabinet containing a lattice wall, at least a first vertical chamber connected to a channel with a flat fan, at least a first horizontal chamber, at least a second vertical chamber, at least a second horizontal chamber, at least a third horizontal chamber, and a helical fan, wherein the dual purpose hood configured to convert a biological hood to a chemical hood utilizing movement of a mobile plate and change of an air flow.

Description

Dual-Purpose Hood

The present discloser application claims priority from IR Patent Application, Application No 139850140003004790, filed on August 30, 2019, which is incorporated by reference herein in its entirety.

This application is related to a laboratory hood that have an ability of converting a biological function to a chemical function and vice versa.

Laboratory hood is made and designed to protect the operator or experiment procedure, also preserve the laboratory environment against chemical, microbial agents, acidic vapors, burners, alkalis, and other anesthetics and anesthesia vapors caused by chemical interactions, or carcinogenic solvents and materials. Different types of hoods are made and designed for various experiments, each having their specific features to be used in different laboratories according to the type of an application.

Fume hood, known as chemical hood, and laminar hood known as conventional biological or microbial hood are two general types of widely used hoods in this field which each of these hoods have different types. The general mechanism of chemical hoods is that the principle function of the hood is suctioning vapors and air from inside to outside. In biological hoods, protection of personals or experiment environment is done by generating airstream into the hood. In the vertical type, which is more common for use, a front door of a cabinet is opened with a certain extent and air is drawn in the hood through this way where drawn air directed from a floor of the cabinet toward the exhaust filter in the floor. The drawn air is directed downwards through some pores that exist in a front of the hood instead of passing through inner space of the hood (to protect the product against aerosols). And then air is drawn up through a back channel of the hood, and it is fed back into the hood after passing through the HEPA filter. This class of hoods is used for research on animal tissue, cell culture, and specially to work with viruses. According to investigations, class II laminar hoods are the most widely used biological hoods in educational laboratories and typical chemical fume hood is the most widely type used among other chemical hoods for educational laboratories.

Producing each of these hoods in a laboratory environment is both expensive and requires much space, but optimum use of space and minimum cost for producing such hood could be considered. On the other hand, in an educational case, a vision limitation around the hood prevents people that stay in a back row from monitoring experimental procedures, and so on causes a misunderstanding for them. Furthermore, even in a case with limited number of people or students, repeating the procedure may be impossible due to the nature of an experiment, and students should rely on their writings or will miss the experiment if they are absent from a class. moreover, another consideration is using of an undesired hood instead of another one that is desired (especially in schools). In addition, the general name of the hood sometimes misleads students and even the lab administrator into believing that it is a laboratory hood and can be used in any protocol that requires a hood (sometimes similar appearance of the hoods can give rise to such problems). So, this misuse of chemical hoods in biological processes and vice versa sometimes has irreparable consequences.

Therefore, an development and design of a dual-purpose hood system with an applicable and teachable aims is required, wherein the above mentioned problem can be solved utilizing the hood.

This summary is intended to provide an overview of the subject matter of this application, and is not intended to identify essential elements or key elements of the subject matter, nor is it intended to be used to determine the scope of the claimed implementations. The proper scope of this application may be ascertained from the claims set forth below in view of the detailed description below and the drawings.

In a general aspect, the present disclosure is directed to an exemplary multi-purpose hood. The exemplary multi-purpose hood may comprise a cabinet consisting of a lattice wall at an end of the cabinet, a perforated surface at a floor of the cabinet, a roof of the cabinet, a front glass window, and side walls, at least a first vertical chamber such that the first vertical chamber and a channel may be located at a back of the lattice wall, and a flat fan may be located in the channel, at least a first horizontal chamber such that the first horizontal chamber may be located under the perforated surface in the floor of the cabinet, at least a second vertical chamber such that the second vertical chamber may be located at a back of the first vertical chamber. Furthermore, the exemplary multi-purpose hood may comprise at least a second horizontal chamber such that the first horizontal chamber may be connected to the second vertical chamber and the second may transfer between the second horizontal chamber, the first horizontal chamber, and the second vertical chamber. Moreover, the exemplary multi-purpose hood may further comprise at least a third horizontal chamber that may be located above the cabinet such that a HEPA filter may be located under the third horizontal chamber and within the roof of the cabinet, which the third horizontal; chamber may configure to draw air into the cabinet by passing air through the HEPA filter, and the second horizontal chamber may be located upon the third horizontal chamber. In addition. the exemplary multi-purpose hood may also comprise a helical fan that may configure to provide a required force to suction of air from the cabinet to the first horizontal chamber, the second vertical chamber, and the second horizontal chamber through entering into the third horizontal chamber and passing through the HEPA filter such that the helical fan is located in the second horizontal chamber.

The above general aspect may have one or more of the following features. In an exemplary implementation, the exemplary multi-purpose hood may further comprise a front glass lift such that the front glass lift may configure to raise and lower the front glass window of the multi-purpose hood. In an exemplary implementation, the exemplary multi-purposed hood may further comprise a mobile plate and a gearbox motor between the lattice wall and the cabinet roof such that the mobile plate may be moved by utilizing the gearbox motor and completely covers the lattice wall or completely covers the cabinet roof. In an exemplary implementation, the exemplary multi-purpose hood may further comprise an ultraviolet lamp and a visible light lamp such that the ultraviolet lamp and the visible light lamp may be attached to the side walls. In an exemplary implementation, the exemplary multi-purpose hood may further comprise an image capturing device that the image capturing device may configure to record and send an image. In an exemplary implementation, the image capturing device of the exemplary multi-purposed hood may configure to record and remote monitor an experiment. In an exemplary implementation, the image capturing device of the exemplary multi-purpose hood may be connected to a portable computing device. In an exemplary implementation, a chemical hood and a biological hood may be provided in the exemplary multi-purpose hood as a dual-purpose hood. In an exemplary implementation, the exemplary multi-purpose hood may further comprise a keyboard, the keyboard may include a hood selection key and a hood power key such that the hood selection key may be configured to select a type of the hood and the hood power key may be configured to turn on/off of the hood. In an exemplary implementation, the keyboard of the exemplary multi-purpose hood may be configured to teach an experimenter differences between the chemical hood and the biological hood. In an exemplary implementation, a programming of the keyboard may be configured to correct a wrong selection of the type of the hood. In an exemplary implementation, by selection of the chemical hood utilizing the selection key of the keyboard, the mobile plate may move to the roof of the cabinet and covers the HEPA filter and by selection of the hood power key of the exemplary multi-purpose hood, the chemical hood may be turn on and the flat fan may configure to pull out at least on type of vapor through air suction from the first vertical chamber and the channel. In an exemplary implementation, by selection of the biological hood utilizing the selection key of the keyboard, the mobile plate may move to the lattice wall and by selection of the hood power key of the exemplary multi-purpose hood, the air may circulate from the cabinet floor to the first horizontal chamber, the second vertical chamber, the second horizontal chamber, and the third horizontal chamber, and may pass the HEPA filter and may enter the cabinet. In an exemplary implementation, the multi-purpose hood may further comprise a conductor to determine a time for replacement of the HEPA filter and the ultraviolet lamp. In an exemplary implementation, a corrosive and toxic vapor resistance material may be selected to construct the plates of the exemplary multi-purposed hood.

Designing of the multi-purpose hood may reduce the cost of purchasing two separate hoods. Furthermore, it may take up less space in the laboratory, which is very significant due to the urgent need for various equipment in the research and educational spaces. By installing a camera in a designed equipment, the limitation of vision in educational cases is reduced and furthermore, the possibility of recording and remote monitoring of experiments is provided. In addition, impossibility of equipment storing under the hood prevents its efficiency reduction. On the other hand, it teaches an experimenter that there are two different types of chemical and biological hoods, and constraint of using one type of the hood reduces the consequences of misuse due to lack of awareness.

The drawing figures depict one or more implementations in accordance with the present teachings, by way of example only, not by way of limitation. In the figures, like reference numerals refer to the same or similar elements.

Fig.1

illustrates a perspective view of a dual-purpose hood, consistent with one or more exemplary embodiments of the present disclosure.

Fig.2

illustrates a front view of a dual-purpose hood, consistent with one or more exemplary embodiments of the present disclosure.

Fig.3

illustrates a left view of a dual-purpose hood, consistent with one or more exemplary embodiments of the present disclosure.

Fig.4

illustrates an open view of a dual-purpose hood, consistent with one or more exemplary embodiments of the present disclosure.

Fig.5

illustrates a back view of a first vertical chamber of an exemplary dual-purposed hood, consistent with one or more exemplary embodiments of the present disclosure.

Fig.6

[Fig. 6] illustrates a front view of the keyboard of a dual-purpose hood, consistent with one or more exemplary embodiments of the present disclosure.

Fig.7A

illustrates an image of two culture plate containing agar culture medium that the plate shown in a right side of the image was placed in the middle of the exemplary hood, consistent with one or more exemplary embodiments of the present disclosure and the plate shown in a left side of the image was placed outside of the exemplary hood.

In the following detailed description, numerous specific details are set forth by way of examples in order to provide a thorough understanding of the relevant teachings. However, it should be apparent that the present teachings may be practiced without such details. In other instances, well-known methods, procedures, components, and/or circuitry have been described at a relatively high-level, without detail, in order to avoid unnecessarily obscuring aspects of the present teachings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present disclosure is defined only by the appended claims.

The following detailed description is presented to enable a person skilled in the art to make and use the methods and devices disclosed in exemplary embodiments of the present disclosure. For purposes of explanation, specific nomenclature is set forth provide a thorough understanding of the present disclosure. However, it will be apparent to one skilled in the art that these specific details are not required to practice the disclosed exemplary embodiments. Descriptions of specific exemplary embodiments are provided only as representative examples. Various modifications to the exemplary implementations will be readily apparent to one skilled in the art, and the general principles defined herein may be applied to other implementations and applications without departing from the scope of the present disclosure. The present disclosure is not intended to be limited to the implementations shown, but is to be accorded the widest possible scope consistent with the principles and features disclosed herein.

A chemical and a biological hood may be provided in an exemplary multi-purpose hood as a dual-purpose hood to provide possibility of use of these two types of the hood and overcome the mentioned problems.

In one or more exemplary embodiments, the exemplary dual-purpose hood 100, as illustrated in Fig. 1- 3, may comprise a cabinet 101 consisting of a lattice wall 102 at an end of the cabinet 101, a perforated surface 104 at a floor of the cabinet 101, a roof 106, a front glass window 108 and

side walls

110, 112. The perforated surface 104 of the exemplary dual-purpose hood 100 may comprise a plurality of pores 105 such that the pores 105 may be located at an entrance and an end position of the perforated surface 104 ( Fig 1 and Fig. 4). In this exemplary embodiment, the exemplary dual-purposed hood 10 0 may further comprise at least a first vertical chamber 114 . The first vertical chamber 114 and a channel 116 may be located at a back of the lattice wall 102 and a flat fan may be located in the channel 116. Furthermore, the exemplary hood may also include at least a first horizontal chamber 118 and at least a second vertical chamber 120 such that the first horizontal chamber 118 may be located under the perforated surface 104 in the floor of the cabinet 101 and the second vertical chamber 120 may be located behind the first vertical chamber 114. Moreover, in this exemplary embodiment, at least a second horizontal chamber 122 may be configured to connect to the first horizontal chamber 118 such that the first horizontal chamber 118 may be connect to the second vertical chamber 120 and the second vertical chamber 120 may be connect to the second horizontal chamber 122 accordingly air can transfer between these three chambers. At least a third horizontal chamber 123 may be placed above the cabinet 101 of the exemplary dual-purposed hood 100 and a HEPA filter 124 may be located under the third horizontal chamber 123 and within the cabinet roof 106 so air may enter cabinet after passing through the HEPA filter 124. Also, the second horizontal chamber 122 may be located upon the third horizontal chamber 123. Furthermore, in this exemplary embodiment, A helical fan 201may be located in the second horizontal chamber 122, and may configure to provide a required force for air suction from the cabinet to the first horizontal chamber 118, then to the second vertical chamber 120, and thereupon to the second horizontal chamber 122 and finally may draw air into the third horizontal chamber 123 such that air may pass through the HEPA filter 124.

In one exemplary embodiment, the dual-purpose hood 100 may further comprise a system for lifting the front glass window 108, called a front glass lift, so that the front glass lift may include a car window lift or any type of lift. In this exemplary embodiment, the front glass lift may configure to lift or lower the front glass window 108 of the dual-purposed hood 100.

In one exemplary embodiment, the dual-purpose hood 100 further may comprise a mobile plate 301 and a gearbox motor between the lattice wall 102 and the cabinet roof 106. The mobile plate 301 may be moved by the gearbox motor such that the mobile plate 301 may cover completely the lattice wall 102 or may cover completely the cabinet roof 106. As illustrated in Fig.3, a movement path of the mobile plate 301 may be a movement of the mobile plate 301 between the cabinet roof 106 and the lattice wall 102 such that the mobile plate 301 may cover completely the lattice wall 102 or may fully cover the roof 106 of the cabinet. Furthermore, the mobile plate 301 may configure to protect the HEPA filter 124.

In one or more exemplary embodiments, the dual-purpose hood 100 further may comprise an ultraviolet lamp 128 and a visible light lamp 130. In this exemplary embodiment, the ultraviolet (UV) lamp 128 and the visible light lamp 130 may be mounted on the

side walls

110, 112 of the cabinet 101.

In one or more exemplary embodiments, the dual-purpose hood 100 further may comprise an image capturing device 132. The image capturing device 132 may be, for example, a digital camera, a CCD camera, a lens capable of attaching to a screen or a Bluetooth lens. In an exemplary embodiment, the image capturing device 132 may be configured to capture and send an image, and/or remotely recode and monitor an experiment, and/or capture the image and record the experiment simultaneously. In an exemplary embodiment, the image capturing device 132 of the dual-purposed hood 100 may be have a clear glass plate on a lens of the image capturing device 132 that may configure to protect the lens from toxic vapors. In one exemplary embodiment, the image capturing device 132 may be connected to a portable computing device utilizing a wireless connection to transfer data. In an exemplary embodiment, the data may be transferred utilizing a cable. The portable computing device may be, for example, a smart-phone, a personal digital assistant, a personal computer (PC), a laptop computer, a net book computer, a tablet computer, and/or the like.

Fig. 4 illustrates an exemplary open view of the exemplary dual-purpose hood 100, consistent with one or more exemplary embodiments of the present disclosure.In one or more exemplary embodiments, as illustrated in Fig. 4, the second vertical chamber 120 may be divided into two chambers utilizing the channel 116 so that the two chambers of the second vertical chamber 120 may have a path to the first horizontal chamber 118 and the second horizontal chamber 122, and the two chambers may be parallel to each other. Also, the plurality of pores 105 may configure to suction air from the cabinet 101 to the second horizontal chamber 122 and then the third horizontal chamber 123 located upon the HEPA filter 124.

Fig.5 illustrates an exemplary back view of the first vertical chamber 114 of the exemplary dual-purpose hood 100 after removal a back wall (not shown) of the cabinet and the channel 116, consistent with one or more exemplary embodiments of the present disclosure. In one ne or more exemplary embodiments, as illustrated in Fig.5, a back view of the lattice wall 102 including a plurality of meshes 103 and two

small wall pieces

501, 502 that may configure to separate the first vertical chamber 114 from the second vertical chamber 120 and connected to the channel 116 (not shown) may be appeared such that the first vertical chamber 114 may configure to guide infiltrated toxic vapors from the lattice wall meshes 103 to outside of the hood 100 through the channel 116.

In one or more exemplary embodiments, one or more keys may be mounted on the exemplary dual-purpose hood 100. The keys may comprise at least a key for turning on or off of the hood, at least a key for selection of a type of the exemplary hood, at least a key for lifting and/or lowering the front glass window 108, at least a key for turning on/off of the UV lamp 128, and at least a key for turning on/off of the visible light lamp 130. Furthermore, in an exemplary embodiment, the exemplary dual-purpose hood 100 may comprise a display screen that the display screen may configure to show a consuming time of the HEPA filter 124 and the UV lamp 128 so that these two may be replaced at the appointed time.

In one or more exemplary embodiments, the exemplary dual-purpose hood 100 may further comprise a keyboard 134 that may the keys may be mounted upon the keyboard 134. In one or more exemplary embodiments, the keyboard 134 may configure to select the type of the hood and also turn on/off the hood. In one or more exemplary embodiment, the type of the hood may be the chemical hood or the biological hood. Fig. 6 illustrates an exemplary keyboard 134 of the exemplary dual-purpose hood 100, consistent with one or more exemplary embodiments of the present disclosure. The keyboard 134 may include a hood selection key 6 02 and a hood power key 6 03 such that the hood selection key 6 02 may configured to select the type of the hood (chemical or biological) and the hood power key 6 03 may configured to turn on/off of the hood. In one or more exemplary embodiments, the keyboard 134 may further comprise a display screen 6 01 that may configure to illustrate a consuming time of the HEPA filter 124 and the UV lamp 128 that the consuming time may configure to determine a replacement time of the HEPA filter 124 and the UV lamp 128, a lift door key 6 04 and a lower door key 6 05 may configure to raise and lower the

front glass window

108 respectively , a biological fan key 6 06 may configure to turn the fan of hood on in a biological mode, a chemical fan key 6 07 may configure to turn the fan of hood on a chemical mode, a UV key 6 08 and a light key 6 09 may configure to turn on the UV lamp 128 and the visible lamp 130, respectively. In an exemplary embodiment, the keyboard 134 of the exemplary multi-purpose hood 100 may be configured to teach an experimenter differences between the chemical hood and the biological hood. In an exemplary embodiment, a programming may be designed on the keyboard 134 that may be configured to correct a wrong selection of the type of the hood.

In one or more exemplary embodiments, in a case of the chemical hood of the dual-purpose hood 100, by selection of the chemical mode utilizing the selection key 6 02 the mobile plate 301 may be moved to the roof 106 by utilizing the gearbox motor by applying an electronic controller board and a micro-switch, and may cover the HEPA filter 124 against damages that may be caused by toxic vapors from chemicals, and the flat fan may configured to pull out the vapors utilizing air suction from the first vertical chamber and then the channel. In a case of the biological hood, by selection of the biological mode utilizing the selection key 6 02, the mobile plate 301 may be moved toward the lattice wall 102 so may cause a full coverage of the lattice wall 102 and may let air to circulate from the cabinet floor to the first horizontal chamber 118, the second vertical chamber 120, the second horizontal chamber 122, the third horizontal chamber 123, passing through the HEPA filter 124 and may enter the cabinet. Due to the movement of the mobile plate in the hood for converting the two possible hood configurations into each other, it may be impossible to store equipment inside the cabinet 101 of the exemplary hood 100 and therefore the efficiency of the exemplary hood 100 cannot be disturbed during the experiment.

In one exemplary embodiment, the exemplary dual-purpose hood 100 may further comprise a conductor to determine an exact replacement time of the HEPA filter 124. In one exemplary embodiment, the HEPA filter 124 of the exemplary hood may comprise any type of air purifier filter to filter an aerosol particle existing in the exemplary hood 100.

In one or more exemplary embodiments, a gas flame and a faucet, etc. may be installed inside the exemplary hood 100 like other types of the chemical and biological hoods. In one or more exemplary embodiments, the keyboard 134 in the dual-purpose hood may be set in such a way that it may be possible to use one type of the hood at any time.

In one or more exemplary embodiment, the side walls, the floor of the exemplary hood, the cabinet back wall and the mobile plate may be made of an MDF sheet, a stainless-steel sheet or any material that resistant to chemical vapors. In one exemplary embodiment, for example, a plurality of regular grooves may be created utilizing a laser on a metal sheet that may use at an entrance position and end position of the cabinet floor, and furthermore, the metal sheet may be perforated utilizing the laser so that may apply as the back wall of the cabinet. In this exemplary embodiment, the side walls, the floor, the back wall, and the mobile plat may be installed in a proper design and sealed and then a location for the keys may be prepared.

In one or more exemplary embodiments, as shown in Fig. 1, the chemical hood may be made in such a way that the vapors of the hazardous materials may be directed from the meshes 103 of the lattice wall 102 by the flat fan to the vertical chamber 114 at a back of the hood such that may be transferred to an outside of the hood 100 utilizing the channel 116, and the biological hood may be made in such a way that the pores 105 that may be created at the entrance and end of the metal plate of the floor of the cabinet as the exemplary perforated surface 104 may draw the air under the hood and air may be circulated from alongside the exemplary first vertical chamber 114 into the exemplary second horizontal chamber 122 and then the exemplary third horizontal chamber 123 utilizing the helical fan 201. The circulated air may enter the cabinet 101 after passing through the HEPA filter 124. The exemplary visible light lamp 130 may be located on a right-side wall of the cabinet and the exemplary ultraviolet lamp 128 may be mounted on a left side wall of the cabinet that may be in an opposite position compared to the exemplary visible light lamp 130. Furthermore, the exemplary lens 132 may be installed above an entrance of the exemplary hood 100 inside the exemplary cabinet 101 may configure to monitor inside of the cabinet and also record an experiment procedure such that the exemplary lens 132 may be connected to a screen by utilizing a USB cable. A glass shield may be configured to protect the exemplary lens 132 against toxic vapors and fumes.

In this example, at the back of the exemplary lattice wall 102, two exemplary

small walls

501, 502 may be mounted at a distance from the exemplary lattice wall 102 on the both sides in a perpendicular direction which may help to create a correct boundary between the exemplary chambers of the biological hood and the exemplary chambers of the chemical hood such that the exemplary first vertical chamber 114 which may be from the

walls

501, 502 to the exemplary lattice wall 102 may configure to expel gases through the exemplary channel 116 to the outside in the chemical hood without any connection to the biological hood path. On the other hand, in the biological mode, the exemplary second vertical chamber 120 which may also comprise the

small walls

501 and 502 may be extended to the back wall of the exemplary hood 100 such that the exemplary second vertical chamber 120 may configure to direct air from the exemplary first horizontal chamber 118 toward the exemplary helical fan 201.
Performance evaluation of the chemical hood:

There are several standards to examine the chemical hood, the most important of these standards is the ASHRAE 110, EN and DIN test, which is defined according to the global standard. In this standard, two tests are performed to check the correct operation of the chemical hood, and there should be no vortex flow in the cabinet, but the air should be drawn in a linear flow utilizing the flat fan. Therefore, after selecting the chemical hood and turning on the flat fan, an aloe perfume was turned on at the entrance of the hood and the smoke flow was monitored. Another mandatory test of this standard is the detector gas test, which is a factory test in which a mannequin is placed in front of the hood and the front glass window is kept open as standard size and the fan of the hood is turned on. In this case, a detector is placed in the mannequin mouth and SF6 gas is released in the cabinet of the hood, the detector should not show any alarm. In other words, the person in front of the hood is safe from the pollutant gases produced in the hood and the hood protects the user well against hazardous gases. This is a factory test, so the research team used colored smoke generator to monitor the suction power of the hood and to ensure that no gas exit toward the experimenter. Therefore, by utilizing turning on the chemical hood, the colored smoke generator was ignited so that the exit or non-exit of the colored gas from the hood can be monitored correctly, which can be seen with the naked eye.
Performance evaluation of the biological hood :

To evaluate the performance of the biological hood, after sterilizing of the inside of the hood utilizing a cotton and alcohol and also irritation of UV light for twenty minutes and turning the hood on, two plates containing tryptone soya agar were testes such that one of the plates was placed in the middle of the hood in the form of open-lid and the other one was placed in outside of the hood in the form of open-lid. After 20 minutes, the plate's lids were closed and transferred to the incubator for 18 hours for heating at 37 °C to observe a growth or non-growth of bacteria on the plates and evaluate the performance of the biological hood.

Fig.7 illustrates an image of two culture plate containing agar culture medium that the plate shown in a right side of the image was placed in the middle of the exemplary hood, consistent with one or more exemplary embodiments of the present disclosure and the plate shown in a left side of the image was placed outside of the exemplary hood. As illustrated in Fig.7, the lack of bacterial growth in the plate that was kept under the exemplary hood indicates the proper function of the exemplary hood as the biological hood, while the other plate shows some colony of bacteria.

While particular aspects of the present subject matter described herein have been shown and described, it will be apparent to those skilled in the art that, based upon the teachings herein, changes and modifications may be made without departing from this subject matter described herein and its broader aspects and, therefore, the appended claims are to encompass within their scope all such changes and modifications as are within the true spirit and scope of this subject matter described herein. Furthermore, it is to be understood that the invention is solely defined by the appended claims. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations).

It will be understood that the terms and expressions used herein have the ordinary meaning as is accorded to such terms and expressions with respect to their corresponding respective areas of inquiry and study except where specific meanings have otherwise been set forth herein. Relational terms such as first, second, and the like may be used solely to distinguish one entity or action from another without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “comprises,” “comprising,” “including, ” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, apparatus, or device. An element proceeded by “a” or “an” does not, without further constraints, preclude the existence of additional identical elements in the process, method, article, or device that comprises the element. Moreover, “may”, “can” and other permissive terms are used herein for describing optional features of various embodiments. These terms likewise describe selectable or configurable features generally, unless the context dictates.

Claims

A multi-purpose hood comprising:
A cabinet consisting of a lattice wall at an end of the cabinet, a perforated surface at a floor of the cabinet, a roof of the cabinet, a front glass window, and side walls;
At least a first vertical chamber, wherein the first vertical chamber and a channel are located at a back of the lattice wall, and a flat fan is located in the channel;
At least a first horizontal chamber, wherein the first horizontal chamber is located under the perforated surface in the floor of the cabinet;
At least a second vertical chamber, wherein the second vertical chamber is located at a back the first vertical chamber;
At least a second horizontal chamber, wherein the first horizontal chamber is connected to the second vertical chamber and the second vertical chamber is connected to the second horizontal chamber wherein air transfer between the first horizontal, the second vertical, and the second horizontal chambers;
At least a third horizontal chamber, the third horizontal chamber is located above the cabinet wherein a HEPA filter is located under the third horizontal chamber and within the roof of the cabinet, wherein the third horizontal chamber configured to drawn air into the cabinet by passing air through the HEPA filter, wherein the second horizontal chamber is located upon the third horizontal chamber; and
A helical fan, the helical fan configured to provide a required force to suction of air from the cabinet to the first horizontal chamber, the second vertical chamber, and the second horizontal chamber through entering into the third horizontal chamber and passing through the HEPA filter, wherein the helical fan is located in the second horizontal chamber.
The multi-purpose hood according to claim 1, further comprising a front glass lift, wherein the front glass lift configured to raise and lower the front glass window of the multi-purpose hood.
The multi-purpose hood according to claim 1, further comprising a mobile plate and a gearbox motor between the lattice wall and the cabinet roof, wherein the mobile plate is moved by utilizing the gearbox motor and completely covers the lattice wall or completely covers the cabinet roof.
The multi-purpose hood according to claim 1, further comprising an ultraviolet lamp and a visible light lamp, wherein the ultraviolet lamp and the visible light lamp are attached to the side walls.
The multi-purpose hood according to claim 1, further comprising an image capturing device wherein the image capturing device configured to record and send an image.
The multi-purpose hood according to claim 5, wherein the image capturing device is configured to record and remote monitor an experiment.
The multi-purpose hood according to claim 5, wherein the image capturing device is connected to a portable computing device.
The multi-purpose hood according to claim 1, wherein two types of chemical hood and biological hood are provided in a dual-purpose hood.
The multi-purpose hood according to claim 1, further comprising a keyboard, the keyboard including a hood selection key and a hood power key wherein the hood selection key is configured to select a type of the hood and the hood power key is configured to turn on/off of the hood.
The multi-purpose hood according to claim 1, wherein the keyboard is configured to teach an experimenter differences between the chemical hood and the biological hood.
The multi-purpose hood according to claim 1, wherein a programming of the keyboard is configured to correct a wrong selection of the type of the hood.
The multi-purpose hood according to claims 1 and 9, wherein by selection of the chemical hood utilizing the selection key of the keyboard, the mobile plate moves to the roof of the cabinet and covers the HEPA filter, wherein by selection of the hood power key, the chemical hood is turn on and the flat fan configured to pull out at least on type of vapor through air suction from the first vertical chamber and the channel.
The multi-purpose hood according to claims 1 and 9, wherein by selection of the biological hood utilizing the selection key of the keyboard, the mobile plate moves to the lattice wall, wherein by selection of the hood power key the air circulate from the cabinet floor to the first horizontal chamber, the second vertical chamber, the second horizontal chamber, and the third horizontal chamber, passing the HEPA filter and enters to the cabinet.
The multi-purpose hood according to claims 1, wherein the multi-purpose hood further comprising a conductor to determine an exact time for replacement of the HEPA filter and the ultraviolet lamp.
The multi-purpose hood according to claim 1, wherein a corrosive and toxic vapor resistance material is selected to construct the plates of the hood.