CA2567863C - Programmable controller for condition air curtains - Google Patents
Programmable controller for condition air curtains Download PDFInfo
- Publication number
- CA2567863C CA2567863C CA2567863A CA2567863A CA2567863C CA 2567863 C CA2567863 C CA 2567863C CA 2567863 A CA2567863 A CA 2567863A CA 2567863 A CA2567863 A CA 2567863A CA 2567863 C CA2567863 C CA 2567863C
- Authority
- CA
- Canada
- Prior art keywords
- control
- air curtain
- electronic controller
- air
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004891 communication Methods 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 claims description 7
- 230000004913 activation Effects 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 238000004378 air conditioning Methods 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 230000000153 supplemental effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F9/00—Use of air currents for screening, e.g. air curtains
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Fluid Mechanics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A programmable electronic controller that provides multiple command and control instruction for an air curtain being integrated therewith. The controller includes operational controls for fan speed, time adjustment duration including time delay, start time, stop time with internal selectable timer clock provisions. The temperature imputable parameters for on demand heat and a variety of remote sensing and actuation output and input provisions.
Description
PROGRAMMABLE CONTROLLER FOR CONDITION AIR CURTAINS
BACKGROUND OF THE INVENTION
1. Technical Field This device relates to air supply and conditioning devices specifically air curtains that generate a controlled stream of air to separate two distinct environments in a variety of operational venues.
BACKGROUND OF THE INVENTION
1. Technical Field This device relates to air supply and conditioning devices specifically air curtains that generate a controlled stream of air to separate two distinct environments in a variety of operational venues.
2. Description of Prior Art Prior art devices of this type have been developed to provide air barriers between contrasting temperature conditions such as between conditioned air space and unconditioned air space.
Typically, air curtains are used as an effective fluid barrier which will not restrict object transfer while maintaining the desired environmental conditions within the access space. Such prior art air curtains are positioned either above or on the side of a threshold to be controlled utilizing multiple fans and directional airflow nozzles, see for example U.S. Patent 3,797,373 as representative of same.
Current air curtain design and controls allow for selective heating or cooling of the barrier air stream utilizing a collection of independent control parameters such as air speed, cooling or heating activation and selective on/off controls. Such independent control activation configurations can be seen generally, for example, in U.S. Patents 6,595,429 and 6,619,052.
Other electronic control devices for heating and air conditioning controllers are well established within the art such as temperature controls; see for example electronically controlled programmable thermostats; U.S. Patent 4,298,949 and 4,606,401.
U.S. Patent 3,797,373 is directed to a basic air curtain device.
Patent 6,619,052 claims a variable air curtain velocity control for supermarket refrigeration product display cases b controlling fans to alternate the airflow rate.
Patent 6,595,429 if directed towards an operation and method for providing real time condition air curtain utilizing electronic control heating and fan using air characteristic inputs from temperature pressure and flow rate sensors within the control system.
Finally, U.S. Patents 4,298,946 and 4,606,401 utilize electronic programmable thermostats with means for selective ambient temperature compared with a pre-programmed set point and activation appropriate heating and/or air cooling equipment controlled by the thermostat. Such thermostats are well known and understood within the art.
No known prior art provides for integral digital programmable controller for an air curtain which combines a wide range of control functions in an integrated application to configure air curtain performance to the individual use variant requirements.
SUMMARY OF THE INVENTION
A programmable air curtain controller that provides a variety of interdependent demand and control functions using multiple internal and remote sensors in communication with a microprocessor configured to meet specific air curtain control elements. Predetermined and preset operational parameters specify to the operational environment and venues are stored within the controller allowing a single integrated intelligent switch controller to regulate all aspects of air curtain performance by remote control input.
Typically, air curtains are used as an effective fluid barrier which will not restrict object transfer while maintaining the desired environmental conditions within the access space. Such prior art air curtains are positioned either above or on the side of a threshold to be controlled utilizing multiple fans and directional airflow nozzles, see for example U.S. Patent 3,797,373 as representative of same.
Current air curtain design and controls allow for selective heating or cooling of the barrier air stream utilizing a collection of independent control parameters such as air speed, cooling or heating activation and selective on/off controls. Such independent control activation configurations can be seen generally, for example, in U.S. Patents 6,595,429 and 6,619,052.
Other electronic control devices for heating and air conditioning controllers are well established within the art such as temperature controls; see for example electronically controlled programmable thermostats; U.S. Patent 4,298,949 and 4,606,401.
U.S. Patent 3,797,373 is directed to a basic air curtain device.
Patent 6,619,052 claims a variable air curtain velocity control for supermarket refrigeration product display cases b controlling fans to alternate the airflow rate.
Patent 6,595,429 if directed towards an operation and method for providing real time condition air curtain utilizing electronic control heating and fan using air characteristic inputs from temperature pressure and flow rate sensors within the control system.
Finally, U.S. Patents 4,298,946 and 4,606,401 utilize electronic programmable thermostats with means for selective ambient temperature compared with a pre-programmed set point and activation appropriate heating and/or air cooling equipment controlled by the thermostat. Such thermostats are well known and understood within the art.
No known prior art provides for integral digital programmable controller for an air curtain which combines a wide range of control functions in an integrated application to configure air curtain performance to the individual use variant requirements.
SUMMARY OF THE INVENTION
A programmable air curtain controller that provides a variety of interdependent demand and control functions using multiple internal and remote sensors in communication with a microprocessor configured to meet specific air curtain control elements. Predetermined and preset operational parameters specify to the operational environment and venues are stored within the controller allowing a single integrated intelligent switch controller to regulate all aspects of air curtain performance by remote control input.
3 DESCRIPTION OF THE DRAWINGS
Figure 1 is a block flow functional diagram outlining the overall control inputs and activation control elements; and Figure 2 is a block flow diagram illustrating specific operational control function elements.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to figure 1 of the drawings, an electronic controller 10 of the invention is illustrated in a graphic block flow configuration inclusive of an air curtain 11 indicated by broken lines responsive to control element groupings and 13 as will be discussed in greater detail hereinafter.
A programmable microprocessor 14 of the controller 10 of the invention and proprietary electronic circuits (not shown) which provide for an integrated communication network 15 illustrated by communication lines to control the operation of the air curtain control element groupings 12 and 13. Such control elements included in this example are multiple fan motor assemblies 16 with adjustable velocities with associated air conditioning elements 17 for heating and cooling of the air curtain 11 air source. The fan motor assembly 16 supply an air
Figure 1 is a block flow functional diagram outlining the overall control inputs and activation control elements; and Figure 2 is a block flow diagram illustrating specific operational control function elements.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to figure 1 of the drawings, an electronic controller 10 of the invention is illustrated in a graphic block flow configuration inclusive of an air curtain 11 indicated by broken lines responsive to control element groupings and 13 as will be discussed in greater detail hereinafter.
A programmable microprocessor 14 of the controller 10 of the invention and proprietary electronic circuits (not shown) which provide for an integrated communication network 15 illustrated by communication lines to control the operation of the air curtain control element groupings 12 and 13. Such control elements included in this example are multiple fan motor assemblies 16 with adjustable velocities with associated air conditioning elements 17 for heating and cooling of the air curtain 11 air source. The fan motor assembly 16 supply an air
4 velocity disturbance outflow from the air curtain creating an effective "barrier" or air curtain at a threshold between two divergent environmental areas.
Information data input element groupings 18 indicated by inclusive broken lines interlinked via the communication network 15 as hereinbefore described to the microprocessor 14 and air curtain control group 13. Such multiple information data source inputs are defined by a remote thermostat 19, internal control thermostat 20, motor fan speed maintaining sensors 21 along with threshold proximity motion sensors 22 and threshoid contact sensors 23 such may be required in certain use venue conditions for access threshold indication.
An infrared sensor 24 is provided with the data source inputs which will receive coded input data signals from an infrared remote transmitter 25. The combination of data input element group 18 of the control group 13 and control element group12 provide the necessary functions for the process controller of the air curtain 11 to assure proper and effective operation in application and installation settings as follows.
Application influence would include effective mounting height and size of the air curtain for the air stream required. Additional criteria such as air curtain mounting location and environmental factors including determination of prevailing
Information data input element groupings 18 indicated by inclusive broken lines interlinked via the communication network 15 as hereinbefore described to the microprocessor 14 and air curtain control group 13. Such multiple information data source inputs are defined by a remote thermostat 19, internal control thermostat 20, motor fan speed maintaining sensors 21 along with threshold proximity motion sensors 22 and threshoid contact sensors 23 such may be required in certain use venue conditions for access threshold indication.
An infrared sensor 24 is provided with the data source inputs which will receive coded input data signals from an infrared remote transmitter 25. The combination of data input element group 18 of the control group 13 and control element group12 provide the necessary functions for the process controller of the air curtain 11 to assure proper and effective operation in application and installation settings as follows.
Application influence would include effective mounting height and size of the air curtain for the air stream required. Additional criteria such as air curtain mounting location and environmental factors including determination of prevailing
5 winds, geographic location of installation site as well as existing conditions, such as structure pressurization, or negative pressure and threshold obstructions will all be determining factors in control requirements, their performance of the air curtain and the requirements of the electronic controller 10 of the invention.
Installation settings are defined within the art such as air curtain 11 air speed setting to match application thresholds, automatic operation by interfacing with threshold access elements utilizing motion sensors 22 and threshold access contact sensors 23 as well as the supplemental heating and cooling with -operation application optimization enclosure of high speed fan and motor assemblies 16 including start, delay and off cycling therefore the air curtain 11 all of which, as noted, are well known and understood by those skilled in the art and do not require further additional detailed explanation or supplemental illustration within the specification.
A visual display unit 14A is provided for the electronic controller 10 of the invention and is in communication with the microprocessor 14 to provide visual indication of input and preset performance parameters.
Installation settings are defined within the art such as air curtain 11 air speed setting to match application thresholds, automatic operation by interfacing with threshold access elements utilizing motion sensors 22 and threshold access contact sensors 23 as well as the supplemental heating and cooling with -operation application optimization enclosure of high speed fan and motor assemblies 16 including start, delay and off cycling therefore the air curtain 11 all of which, as noted, are well known and understood by those skilled in the art and do not require further additional detailed explanation or supplemental illustration within the specification.
A visual display unit 14A is provided for the electronic controller 10 of the invention and is in communication with the microprocessor 14 to provide visual indication of input and preset performance parameters.
6 The air curtain controller 10 of the invention has serial input and output connections at 26A and 26B which provide for serial connection to additional controllers (not shown) if needed in multiple unit applications.
Referring now to figure 2 of the drawings, the electronic air curtain controller 10 of the invention manages the proper and effective air curtain 11 operation illustrated by the controllers 10 operational feature function as follows.
A speed control function 27 controlling fan motor assembly's 16 speed directly via auxiliary controls (not shown) if required. A feedback circuit 28 function is provided that monitors and adjusts to maintain a given set point for the fan motor assemblies 16. Optionally, such control parameters can also be utilized to manage the fan motor assemblies 16 such as pressure differentials between control spaces as indicated in broken lines graphically at 29.
An air curtain full speed start function 30 is used to initiate maximum fan motor assembly 16 speed to establish the initial air barrier rapidly in structures where the threshold is opened and protection must be rapidly established. The full speed start 30 function then employs a reduction of fan motor assembly's speed once the air barrier is established to maintain an operational velocity.
Referring now to figure 2 of the drawings, the electronic air curtain controller 10 of the invention manages the proper and effective air curtain 11 operation illustrated by the controllers 10 operational feature function as follows.
A speed control function 27 controlling fan motor assembly's 16 speed directly via auxiliary controls (not shown) if required. A feedback circuit 28 function is provided that monitors and adjusts to maintain a given set point for the fan motor assemblies 16. Optionally, such control parameters can also be utilized to manage the fan motor assemblies 16 such as pressure differentials between control spaces as indicated in broken lines graphically at 29.
An air curtain full speed start function 30 is used to initiate maximum fan motor assembly 16 speed to establish the initial air barrier rapidly in structures where the threshold is opened and protection must be rapidly established. The full speed start 30 function then employs a reduction of fan motor assembly's speed once the air barrier is established to maintain an operational velocity.
7 The time delay function 31 determines how long the air curtain 11 runs after a threshold closure with control mode settings 32 comprising an on setting 33, auto setting 34 and off setting 35 which in this example is set to auto setting 34. Given the operational parameters, the on setting 33 manually enables the controller and correspondingly the off setting 35 disables the electronic controller 10. The auto setting 34 provides for enabilization by external control data input from the information data input element group 18 as hereinbefore described.
'f"he functionality management by the internal thermostat 20 as hereinbefore described provides for home base control activation of supplemental heating unit 36 and cooling unit 37 of the air conditioning element 17.
Referring now to a clock function indicator at 38 which provides for an event base control wherein the control mode settings 32 are maintained based on the clock and input setting 38A via the communication network 15.
A programming lock mode function 39 will prevent non-authorized access to the operator settings imparting a control security oversight of the electronic controller 10.
'f"he functionality management by the internal thermostat 20 as hereinbefore described provides for home base control activation of supplemental heating unit 36 and cooling unit 37 of the air conditioning element 17.
Referring now to a clock function indicator at 38 which provides for an event base control wherein the control mode settings 32 are maintained based on the clock and input setting 38A via the communication network 15.
A programming lock mode function 39 will prevent non-authorized access to the operator settings imparting a control security oversight of the electronic controller 10.
8 In applications where multiple electronic controllers are used, the allowance for unlimited master slave inner control between the multiple connected controllers a so-called "daisy chain" functionality 40 is provided wherein a setting on one of the interconnected controllers 10 in such configurations will change the corresponding sefting on all of the interconnected controllers 10 of the system via the serial input and output ports 26A and 26B
as hereinbefore described.
As noted, the electronic controller 10 enabled with a remote control function 41 by the hereinbefore described infrared receiver 24 and command and control infrared transmitter 25.
It will thus be seen that a new and novel factory installed digital programmable controller 10 for environmental air curtain 11 applications has been illustrated and described and it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention.
as hereinbefore described.
As noted, the electronic controller 10 enabled with a remote control function 41 by the hereinbefore described infrared receiver 24 and command and control infrared transmitter 25.
It will thus be seen that a new and novel factory installed digital programmable controller 10 for environmental air curtain 11 applications has been illustrated and described and it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention.
9
Claims (7)
1. An integrated programmable electronic controller for air handling equipment comprises in combination, an air curtain apparatus to establish an airflow stream as an environmental barrier between temperature divergent environments, and multiple sensor interfaced with air curtain command and control, said controller having an integrated central microprocessor, a control data input group and a control element group;
a communication network interconnecting said air curtain and respective control data input and control element groups with said central microprocessor, said control data input group comprising, a first temperature sensor for obtaining an internal temperature value, a second temperature sensor for obtaining a remote temperature value of said temperature divergent environments, a fan motor speed sensor for adjusting air velocity of said air curtain, a threshold motion sensor, contact threshold sensor and a remote control sensor, said control element group comprising an air curtain fan motor assembly and air conditioning units, input data control values as functional control messages including a full speed start for said fan motor assemblies and operational time delay for said air curtain controller, means for communication with additional controllers, threshold control mode settings of said control data input group comprising an off setting, an on setting and an auto setting and a clock control for an event based control of said threshold control mode settings, network for transmitting data from said data input group and intercommunication transmission with said control element group and display means.
a communication network interconnecting said air curtain and respective control data input and control element groups with said central microprocessor, said control data input group comprising, a first temperature sensor for obtaining an internal temperature value, a second temperature sensor for obtaining a remote temperature value of said temperature divergent environments, a fan motor speed sensor for adjusting air velocity of said air curtain, a threshold motion sensor, contact threshold sensor and a remote control sensor, said control element group comprising an air curtain fan motor assembly and air conditioning units, input data control values as functional control messages including a full speed start for said fan motor assemblies and operational time delay for said air curtain controller, means for communication with additional controllers, threshold control mode settings of said control data input group comprising an off setting, an on setting and an auto setting and a clock control for an event based control of said threshold control mode settings, network for transmitting data from said data input group and intercommunication transmission with said control element group and display means.
2. The integrated programmable electronic controller set forth in claim 1 wherein said means for communicating with additional electronic controllers comprise, serial inputs and output links.
3. The integrated programmable electronic controller set forth in claim 1 wherein said predefined set of function control messages include fan motor assembly, speed control, a data feedback circuit to maintain preset fan motor speed values.
4. The integrated programmable electronic controller set forth in claim 1 wherein said remote control sensor comprises, an infrared receiver and a remote located infrared control data transmitter.
5. The integrated programmable electronic controller set forth in claim 4 wherein said remote located infrared control data transmitter has preprogrammed control messages and imputable control messages for said control element group.
6. The integrated programmable electronic controller set forth in claim 1 wherein said first and second temperature sensor values define control data input activation of said air conditioning elements to heat, cool airflow stream and fan motor speed assemblies dependent on preprogrammable set values.
7. The integrated programmable electronic controller set forth in claim 1 wherein said threshold control mode settings further include, a programmable lock mode and multiple electronic control interface therewith.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2567863A CA2567863C (en) | 2006-11-14 | 2006-11-14 | Programmable controller for condition air curtains |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2567863A CA2567863C (en) | 2006-11-14 | 2006-11-14 | Programmable controller for condition air curtains |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2567863A1 CA2567863A1 (en) | 2008-05-14 |
| CA2567863C true CA2567863C (en) | 2014-04-22 |
Family
ID=39400503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2567863A Active CA2567863C (en) | 2006-11-14 | 2006-11-14 | Programmable controller for condition air curtains |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2567863C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5859960B2 (en) | 2009-07-17 | 2016-02-16 | テクニカル ユニバーシティ オブ デンマークＴｅｃｈｎｉｃａｌ Ｕｎｉｖｅｒｓｉｔｙ Ｏｆ Ｄｅｎｍａｒｋ | Devices and methods for reducing the spread of microorganisms and health hazards in the air and / or for protecting against microorganisms and health hazards in the air |
| NL2010998C2 (en) * | 2013-06-18 | 2014-12-22 | Biddle B V | Air curtain device measuring a temperature profile and method there for. |
-
2006
- 2006-11-14 CA CA2567863A patent/CA2567863C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2567863A1 (en) | 2008-05-14 |
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