JP2009142356A - Air purifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air purifier capable of suppressing reproduction of ticks and mold near a floor surface and demonstrating a sterilizing function by generating a large amount of ions from a blow-off port provided to the front surface lower part of a main body. <P>SOLUTION: The air purifier has at least a lower blow-off port 2 provided to the front surface lower part of the main body 1, a ventilation path 4 from a suction port 3 provided to the surface of the main body 1 to the lower blow-off port 2, and an air purifying filter 5 and a blower 6 disposed in the ventilation path 4 and the lower blow-off port 2 is provided with a negative ion generator 7. Thus, by blowing off air containing negative ions from the lower blow-off port 2 provided near the floor surface, they directly act on the ticks and mold living in a carpet or tatami to suppress the reproduction, and a sterilizing effect is provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air cleaner that takes in indoor air from a suction port and cleans it with a filter, and blows out clean air containing negative ions from a blowout port.

Conventionally, as shown in FIG. 7, this type of air purifier includes a main body 101 including an air inlet 102, a filter 103, an ion generator 104, a lower outlet 105, an upper outlet 106, a fan 107, and a damper 108. Yes. The lower discharge port 105 is disposed in the vicinity of the floor surface 109, and the upper discharge port 106 is disposed upward. Indoor air is taken in through the air inlet 102 and dust is filtered out by the filter 103. The ion generator 104 in the main body 101 generates negative ions in the air taken in from the air inlet 102, thereby releasing air containing negative ions from the lower outlet 105 and the upper outlet 106, and the damper 108 is The ratio of the discharge amount of air containing negative ions from the lower discharge port 105 and the upper discharge port 106 is switched.
JP 2007-236470 A

  In such a conventional air purifier, since an ion generator is provided on the intake side of the fan, negative ions adhere to the surface of each component when passing through the fan, damper and ventilation path in the main body. In addition, since the amount of ions blown out from the lower discharge port is greatly reduced, there is a problem that the sterilization function cannot be sufficiently exhibited, and it is required to release a large amount of negative ions from the lower discharge port.

  The present invention solves such a conventional problem, and generates a large amount of negative ions from the outlet provided at the lower front of the main body to suppress the growth of mites and fungi near the floor. It aims at providing the air cleaner which can demonstrate a fungi function.

  In order to achieve the above object, an air cleaner according to the present invention includes at least a lower air outlet provided at a lower front portion of a main body, a ventilation path extending from a suction port provided on the surface of the main body to the lower air outlet, It has an air purification filter and a blower arranged on the road, and a negative ion generator is provided at the lower outlet.

  Further, the other means has an upper air outlet provided in the upper part of the main body, an auxiliary air passage that communicates the discharge side of the blower and the upper air outlet, and a second negative ion generator is provided at the upper air outlet. Is provided.

  Another means is that a pair of suction ports are provided on the left and right side portions of the main body, and a wind direction changing plate that can be switched between the horizontal direction and the elevation direction is provided at the lower outlet.

  Another means is that the operation unit of the main body is provided with an absence operation mode, and when the absence operation mode is set, the control unit keeps the wind direction change plate of the lower outlet in the horizontal direction for a predetermined time and turns the blower into a strong wind. Driving.

  Another means is that the main body is provided with a gas sensor, and when the detected value of the gas sensor exceeds a threshold value, the control unit changes the wind direction changing plate in the elevation direction.

  Another means is that an opening / closing lid is provided at the lower outlet, and a return air passage communicating with the suction side when the opening / closing lid is closed is formed, and the negative ion provided at the lower outlet is passed through the return air passage. The negative ion from the generator is supplied to the air purification filter.

  Further, the other means is provided with a dust sensor close to the floor surface in the main body, and when the detection value of the dust sensor exceeds a threshold value, the control unit closes the lower air outlet with an opening and closing lid, The blower is operated with strong wind.

  In addition, another means is provided with a human sensor for detecting a human body present on the front surface of the main body, and when the human sensor detects the human body, the control unit closes the lower outlet with an opening / closing lid. It will be.

  Another means is that when the human sensor does not detect a human body, the control unit opens the opening / closing lid of the lower outlet.

  Another means is that when the human sensor does not detect a human body, the control unit operates the blower at the maximum air volume.

  According to the present invention, there are provided at least a lower air outlet provided in the lower front portion of the main body, an air passage extending from the suction port provided on the surface of the main body to the lower air outlet, and an air purification filter and a fan disposed in the air passage. And by providing a negative ion generator at the lower outlet, blowing out air containing negative ions from the lower outlet provided near the floor, directly to the mites and molds that inhabit the carpet and tatami It is possible to provide an air purifier having an effect of acting to suppress propagation and to have a sterilizing effect.

  In addition, by having an upper air outlet provided in the upper part of the main body, an auxiliary air passage that communicates the discharge side of the blower and the upper air outlet, and the second negative ion generator is provided in the upper air outlet The room can be filled with negative ions by the two upper and lower circulating airflows including negative ions blown out from the upper and lower outlets, and mites, molds, germs, etc. adhering to the floor, walls and curtains. And the dust floating in the indoor space can be efficiently guided to the suction port.

  In addition, a pair of suction ports are provided on the left and right side surfaces of the main body, and a wind direction changing plate that can be switched between the horizontal direction and the elevation angle direction is provided at the lower outlet, so that The air direction from the air outlet can be adjusted to the horizontal direction or the elevation angle direction.When blowing in the elevation direction, clean air is circulated in the room to prevent the scattering of documents on the floor surface, and when blowing in the horizontal direction, the floor surface Can suppress the propagation of mites and molds, and can achieve a sterilization effect.

  In addition, when the absence operation mode is set in the operation unit of the main body, and when the absence operation mode is set, the control unit makes the wind direction change plate of the lower outlet outlet in the horizontal direction only for a predetermined time, thereby operating the blower with strong wind, If the absence mode is set in the operation unit when the user goes out, the clean air containing negative ions on the surface of the living area, such as tatami mats and carpets, is blown out with a strong wind for a predetermined time. Suppresses the growth of fungi and can exert a deodorizing function.

  In addition, a gas sensor is provided in the main body, and when the detected value of the gas sensor exceeds a threshold value, the control unit changes the wind direction changing plate in the elevation direction, thereby removing air pollution such as tobacco odor with the gas sensor. When detected, the control unit changes the wind direction changing plate of the lower outlet to the elevation angle direction, blows clean air together with the upper outlet, smoothly circulates in the indoor upper space, and gaseous substances such as odor components Can be introduced into the suction port and efficiently removed.

  In addition, an opening / closing lid is provided at the lower air outlet, a return air passage communicating with the suction side when the opening / closing lid is closed is formed, and the minus air from the negative ion generator provided at the lower air outlet is passed through the return air passage. By supplying ions to the air purification filter, a return air passage is provided to return the blown air to the air purification filter when the open / close lid provided at the lower outlet is closed. The clean air is sucked into the air purification filter, the odor component adhering to the air purification filter is decomposed, and the growth of ticks and molds contained in dust can be suppressed.

  In addition, a dust sensor is installed in the main body close to the floor, and when the detection value of the dust sensor exceeds a threshold value, the control unit closes the lower outlet with an open / close lid and operates the blower with strong wind. By attaching the dust sensor close to the floor surface, and immediately detecting dust rising from the floor, close the open / close lid provided at the lower outlet and operate the blower with a strong notch to The dust collection efficiency can be improved while preventing the dust floating around, and the draft feeling can be prevented.

  In addition, a human sensor that detects the human body present on the front surface of the main body is provided, and when this human sensor detects the human body, the control unit closes the lower outlet with an opening / closing lid, thereby detecting the human sensor. Therefore, when the user is at the front of the air purifier, the lid of the lower outlet is closed to prevent drafts during cold weather, improve comfort, and prevent newspapers and documents from scattering Can be.

  In addition, when the human sensor is not detecting the human body, the control unit opens the open / close lid of the lower air outlet, and by the human sensor, the open / close lid of the lower air outlet is opened when there is no user on the front of the main body. And clean air containing negative ions is blown out near the floor surface to keep the floor surface of the living area clean.

  In addition, when the human sensor does not detect the human body, the control unit operates the blower with the maximum air flow.When the human sensor does not detect the human body, the controller operates the fan with the maximum air flow. The floor surface of the living area and the indoor space can be cleaned in a short time without being affected by the noise or draft of the main body.

  The air cleaner according to claim 1 of the present invention includes at least a lower air outlet provided at the lower front portion of the main body, a ventilation path extending from the suction port provided on the surface of the main body to the lower air outlet, and the air passage. The lower air outlet is provided with a negative ion generator, a lower air outlet is provided at the lower front of the main body, an upper air outlet is provided at the top of the main body, There is a ventilation path extending from the suction port provided on the surface to the lower outlet, and an air purification filter and a blower arranged in the ventilation path, and by providing a negative ion generator at the lower outlet, near the floor surface Since the air containing negative ions can be blown out from the lower outlet provided, the amount of negative ions is released from the negative ion generator without being attenuated by the ventilation path or obstacles in the equipment. Since a large amount of negative ions can be blown out along the floor surface, it directly acts on mites and molds that inhabit the carpets and tatami mats on the floor surface to suppress breeding and to have a sterilizing effect. Has the effect of being able to

  In addition, an upper air outlet provided in the upper part of the main body, an auxiliary air passage that communicates the discharge side of the blower and the upper air outlet, and a second negative ion generator is provided in the upper air outlet. Yes, the second negative ion generator is installed inside the upper air outlet, and negative ions are blown out together with the air purified by the filter from the upper air outlet, and negative ions from the upper air outlet and the lower air outlet. The air containing air flows from above and below and merges near the center to form two circulation areas in the indoor space. When the circulating airflow moves along the floor and walls, negative ions It has the effect | action that it can suppress the proliferation of mold | fungi and various germs by an effect | action, and can guide efficiently the dust which floats in indoor space to the suction inlet of a main body.

  In addition, a pair of suction ports are provided on the left and right side surfaces of the main body, and the lower air outlet is provided with a wind direction changing plate that can be switched between a horizontal direction and an elevation angle direction, and the lower air outlet is provided with an air direction changing plate. By setting the wind direction change plate in the elevation direction, it is possible to prevent the accumulation of accumulated dust and documents, circulate clean air in the room, and to suppress or remove the generation of odors and mold on the floor surface when blown horizontally. Bacteria effect can be obtained, and by providing a pair of suction ports on the left and right side parts of the main body, a short circuit from the lower air outlet allows the blowout air containing negative ions to circulate from the front to the side of the main body And a clean space containing negative ions can be formed on the front surface of the main body.

  In addition, when the absence operation mode is set in the operation unit of the main body and the absence operation mode is set, the control unit sets the wind direction change plate of the lower outlet to the horizontal direction for a predetermined time and operates the blower with a strong wind. Yes, when the user sets the absence mode in the operation unit of the main unit, the control unit sets the wind direction changing plate of the lower outlet in the horizontal direction, sets the blower to strong wind and timers for a predetermined time By driving, when the user goes out, etc., the air dirt trapped in the room is cleaned, and clean air containing negative ions is blown out on the surface of the user's living area such as tatami mats and carpets. In addition, it has the effect of suppressing the propagation of ticks and fungi and exerting a sterilizing function.

  Also, a gas sensor is provided in the main body, and when the detected value of the gas sensor exceeds a threshold value, the control unit changes the wind direction changing plate in the elevation direction, such as malodorous components floating in the room When air pollution such as cigarette odor is detected by the gas sensor, the control unit changes the wind direction change plate provided at the lower air outlet in the elevation direction, so that clean air from above and below is combined with the upper air outlet. The synergistic action of blowing out allows the air to smoothly circulate in the upper space of the room, and guides the relatively light polluted air in the form of gas to the inlet of the main body. Further, at this time, by operating the blower with a strong notch, the whole room can be filled with clean air quickly.

  In addition, an opening / closing lid is provided at the lower air outlet, a return air passage communicating with the suction side when the opening / closing lid is closed is formed, and the minus air from the negative ion generator provided at the lower air outlet is passed through the return air passage. It is configured to supply ions to the air purification filter, and when it is not necessary to blow air from the lower air outlet on the front, it is communicated at this time by closing the open / close lid provided at the lower air outlet Since the clean air with negative ions is short-circuited and returns to the air purification filter through the return air passage configured in, negative ions can be supplied to the air purification filter, reducing odor components adhering to the air purification filter In addition, it suppresses the growth of mites and molds contained in the collected dust, and can inactivate bacteria and viruses. A.

  In addition, a dust sensor is installed in the main body close to the floor, and when the detection value of the dust sensor exceeds a threshold value, the control unit closes the lower outlet with an open / close lid and operates the blower with strong wind. An open / close lid provided by the control unit at the lower outlet when the dust sensor detects the degree of contamination such as dust near the floor and the detected value exceeds a predetermined threshold. By closing the fan and operating the fan with a strong notch, it is possible to prevent the dust floating near the floor from scattering and to make it easier to form an air flow in the direction of the suction port of the main unit, and to prevent strong wind from hitting the human body. Thus, the draft feeling can be prevented.

  In addition, a human sensor that detects the human body present on the front surface of the main body is provided, and when the human sensor detects the human body, the control unit is formed by closing the lower outlet with an open / close lid, When there is a user on the front of the main unit, it is detected by a human sensor, and the control unit closes the opening / closing lid of the lower outlet, thereby blowing out clean air from the upper outlet and directing the user directly on the wind. In this way, it is possible to prevent drafts during cold weather and to prevent newspapers and documents placed on the floor surface from scattering.

  In addition, when the human sensor does not detect the human body, the control unit opens the opening / closing lid of the lower outlet, and when there is no user on the front of the main body, it is not detected by the human sensor. Therefore, the control unit can blow out a large amount of clean air containing negative ions near the floor surface by opening the opening / closing lid of the lower outlet, reducing the odor attached to the carpet, etc., and breeding of mites and molds It has the effect | action that it can suppress.

  Moreover, when the human sensor does not detect the human body, the control unit operates the blower at the maximum air volume. When the human sensor does not detect the human body, there is no user in the room. Therefore, when the control unit operates the blower at the maximum air volume, the indoor space can be cleaned in a short time, and when the user returns to the room, the floor surface of the living area and the indoor air are efficient. It is well cleaned and has the effect that it can be prevented from being affected by noise and draft feeling of the main body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 to 3, at least a lower air outlet 2 provided in the lower front portion of the main body 1, an air passage 4 extending from the suction port 3 provided on the surface of the main body 1 to the lower air outlet 2, and this air passage 4 has an air purification filter 5 and a blower 6, and a negative ion generator 7 is provided at the lower outlet 2.

  Moreover, it has the auxiliary | assistant ventilation path 9 which connects the upper blower outlet 8 provided in the upper part of the main body 1, and the discharge side of the air blower 6, and the upper blower outlet 8, and the 2nd negative ion generator 10 is provided in the upper blower outlet 8. Is provided.

  Moreover, a pair of suction inlets 3 are provided in the left and right side portions of the main body 1, and a wind direction changing plate 12 that can be switched between a horizontal direction and an elevation angle direction is provided at the lower outlet 2.

  In addition, when the absence operation mode (not shown) is provided in the operation unit 13 of the main body 1 and the absence operation mode is set, the control unit 14 keeps the wind direction changing plate 12 of the lower outlet 2 horizontally for a predetermined time. Thus, the blower 6 is operated in a strong wind.

  Moreover, the gas sensor 15 is provided in the main body 1, and when the detected value of the gas sensor 15 exceeds a threshold value, the control unit 14 is configured to change the wind direction changing plate 12 in the elevation angle direction.

  Moreover, it is set as the structure provided with the wind direction change board 12 which can switch to a horizontal direction and an elevation angle direction in the lower blower outlet 2. FIG.

  With the above configuration, the lower air outlet 2 is provided in the lower front portion of the main body 1, the upper air outlet 8 is provided in the top surface of the main body 1, and the ventilation path 4 extending from the suction port 3 provided on the surface of the main body 1 to the lower air outlet 2. And an air purification filter 5 and a blower 6 disposed in the ventilation path 4, and by providing a negative ion generator 7 at the lower air outlet 2, negative ions are contained from the lower air outlet 2 provided near the floor surface. Since the draft can be blown out, a large amount of negative ions discharged from the negative ion generator 7 is blown out along the floor surface without the amount of negative ions being attenuated by the ventilation path 4 or obstacles in the main body 1. Therefore, it can directly act on mites and molds that inhabit the carpets and tatami mats on the floor surface to suppress the breeding and provide a sterilizing effect.

  Further, the second negative ion generator 10 is mounted inside the ventilation path of the upper air outlet 8, and negative ions are blown out from the upper air outlet 8 together with the air purified by the air purification filter 5. Air containing negative ions from the air outlet 2 circulates in the upward and downward directions and merges near the center to form two circulation areas in the indoor space. While moving, it is possible to suppress the growth of mold and bacteria by the action of negative ions, and it is possible to efficiently guide dust floating in the indoor space to the suction port 3 of the main body 1.

  Further, the lower air outlet 2 is provided with a wind direction changing plate 12, and by setting the wind direction changing plate 12 in the elevation direction, it is possible to prevent accumulated dust and documents from being scattered and to circulate clean air in the room and blow it out horizontally. In some cases, it is possible to obtain a sterilization effect by suppressing the generation of odor and mold on the floor surface.

  In addition, by providing a pair of suction ports 3 on the left and right side portions of the main body 1, the blowout air containing negative ions is circulated from the front surface of the main body to the side surfaces to prevent a short circuit from the lower air outlet 2, A clean space containing ions can be formed on the front surface of the main body 1.

  When the user sets the absence mode using the operation unit 13 of the main body 1, the control unit 14 sets the wind direction changing plate 12 of the lower outlet 2 in the horizontal direction and sets the blower 6 to a strong wind. By running the timer for a predetermined time, the user cleans air stains when the user goes out, and creates negative ions on the surface of the user's living area, such as tatami mats and carpets. It blows out the clean air that is contained to suppress the growth of ticks and fungi, and it can exert its sterilizing function.

  Further, when a bad odor component floating in the room is detected by a gas sensor and the air pollution such as tobacco odor is large, the control unit 14 changes the wind direction changing plate 12 provided at the lower outlet 2 in the elevation direction. The synergistic action of blowing clean air from above and below together with the upper air outlet 8 allows the air to smoothly circulate in the upper space of the room and guide the gaseous, relatively light, contaminated air to the air inlet 3 of the main body 1.

  Further, at this time, by operating the blower 6 with a strong notch, it is possible to quickly fill the entire room with clean air.

(Embodiment 2)
As shown in FIGS. 4 to 6, an opening / closing lid 17 is provided at the lower outlet 2, a return air passage 18 communicating with the suction side when the opening / closing lid 17 is closed is formed, and through this return air passage 18, Negative ions from the negative ion generator 7 provided at the lower outlet 2 are supplied to the air purification filter 5.

  Further, the dust sensor 19 is provided in the main body 1 close to the floor surface, and when the detection value of the dust sensor 19 exceeds the threshold value, the control unit 14 closes the lower outlet 2 with the opening / closing lid 17, The blower 6 is operated with a strong wind.

  In addition, a human sensor 20 that detects the human body 21 present on the front surface of the main body 1 is provided, and when the human sensor 20 detects the human body 21, the control unit 14 opens the lower outlet 2 with the opening / closing lid 17. It is a blockage.

  Further, when the human sensor 20 does not detect the human body 21, the control unit 14 opens the opening / closing lid 17 of the lower air outlet 2. When the human sensor 20 does not detect the human body 21, the control unit 14. Is for operating the blower 6 with the maximum air flow.

  With the above configuration, when it is not necessary to blow air from the lower blower outlet 2 on the front surface, the return wind is configured to be communicated within the main body 1 by closing the open / close lid 17 provided at the lower blower outlet 2. Since the clean air charged with negative ions passes through the path 18 and returns to the air purification filter 5 through a short circuit, the negative ions can be supplied to the air purification filter 5 and decompose the odor components adhering to the air purification filter 5. In addition, it is possible to inactivate germs and viruses by suppressing the growth of mites and molds contained in collected dust.

  Further, when the degree of contamination such as dust near the floor surface is detected by the dust sensor 19 and the detected value exceeds a predetermined threshold value, the control unit 14 opens the open / close lid 17 provided at the lower outlet 2. By closing and operating the blower 6 with a strong notch, it is possible to prevent scattering of dust floating near the floor surface and to easily form an air flow in the direction of the suction port 3 of the main body 1, and a strong wind is applied to the human body 21. The draft feeling can be prevented by not hitting.

  Further, when a user is present on the front surface of the main body 1, when detected by the human sensor 20, the control unit 14 closes the open / close lid 17 of the lower air outlet 2, thereby supplying clean air from the upper air outlet 8 or the like. By blowing out air, it is possible to prevent drafts from being cold when the user is not blown directly, and to prevent newspapers and documents placed on the floor surface from being scattered.

  Further, when there is no user on the front surface of the main body 1, since the human sensor 20 does not detect it, the control unit 14 opens the opening / closing lid 17 of the lower outlet 2, thereby including negative ions near the floor surface. A large amount of clean air can be blown out, odors attached to carpets and the like can be reduced, and mite and mold growth can be suppressed.

  Further, when the human sensor 20 does not detect the human body 21, it is determined that there is no user in the room, and the control unit 14 operates the blower 6 with a strong wind or a maximum air volume, so that the indoor space is shortened for a short time. When the user returns to the room, the floor of the living area and the room air are efficiently cleaned, and the user is affected by noise and draft feeling due to the strong wind operation of the main body 1. Can not be.

1 is an external perspective view of the air cleaner according to Embodiment 1 of the present invention. Sectional drawing which shows the elevation angle state of a ventilation path and a wind direction change board same as the above Same as above, sectional view of the main part showing the horizontal state of the wind direction change plate (A) Cross-sectional view of an air cleaner according to Embodiment 2 of the present invention, (b) Cross-sectional view of relevant parts showing an open state of the open / close lid. The external appearance perspective view which shows the attachment state of a dust sensor similarly Sectional drawing which shows the closed state of the human sensor of an air cleaner, and an opening-and-closing lid Sectional drawing which shows the structure of the conventional air cleaner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lower blower outlet 3 Suction inlet 4 Ventilation path 5 Air purification filter 6 Blower 7 Negative ion generator 8 Upper blower outlet 9 Auxiliary ventilation path 10 2nd negative ion generator 12 Wind direction change board 13 Operation part 14 Control part 15 Gas sensor 17 Open / close lid 18 Return air path 19 Dust sensor 20 Human sensor 21 Human body

Claims (10)

A lower air outlet provided at least on the lower front surface of the main body, an air passage extending from the suction port provided on the surface of the main body to the lower air outlet, an air purification filter and a fan disposed in the air passage, and the lower air outlet An air cleaner with a negative ion generator at the outlet. 2. An upper air outlet provided in an upper portion of the main body, an auxiliary air passage that communicates the discharge side of the blower and the upper air outlet, and a second negative ion generator is provided in the upper air outlet. Air purifier. The air cleaner according to claim 1 or 2, wherein a pair of suction ports are provided on the left and right side portions of the main body, and a wind direction changing plate that can be switched between a horizontal direction and an elevation angle direction is provided at the lower outlet. 4. An answering mode is provided in the operation unit of the main body, and when the answering mode is set, the control unit sets the wind direction changing plate of the lower outlet to the horizontal direction for a predetermined time and operates the blower in a strong wind. The air cleaner described. The air cleaner according to claim 3, wherein a gas sensor is provided in the main body, and when the detected value of the gas sensor exceeds a threshold value, the control unit changes the wind direction changing plate in the elevation direction. An opening / closing lid is provided at the lower air outlet, and a return air passage communicating with the suction side is formed when the opening / closing lid is closed, and negative ions from the negative ion generator provided at the lower air outlet are passed through the return air passage. The air cleaner according to claim 1, wherein the air cleaner is configured to be supplied to an air purification filter. When the dust sensor is provided close to the floor on the main body and the detection value of the dust sensor exceeds the threshold value, the control unit closes the lower outlet with an open / close lid and operates the blower with strong wind. The air cleaner according to claim 6. The air according to claim 6, wherein a human sensor for detecting a human body existing on the front surface of the main body is provided, and when the human sensor detects the human body, the control unit closes the lower air outlet with an opening / closing lid. Cleaner. The air cleaner according to claim 6, wherein when the human sensor is not detecting a human body, the control unit opens an opening / closing lid of the lower outlet. The air cleaner according to claim 9, wherein when the human sensor does not detect a human body, the control unit operates the blower at the maximum air volume.

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