JP3256466B2 - Ventilation system for ventilation unit and indoor parking lot - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation unit suitable for ventilating an indoor parking lot such as an underground parking lot, and a ventilation system for an indoor parking lot using the ventilation unit.

[0002]

2. Description of the Related Art In underground parking lots, the ventilation air volume (air supply / exhaust air volume) is determined by law, but the method of flowing air in the parking lot is not specifically defined. Therefore, conventionally, various systems have been adopted.

In this regard, Japanese Patent Application Laid-Open No. 59-1071 has already disclosed.
27 "Ventilation method of parking lot" proposes that air supplied to an indoor parking lot is conveyed in the direction of one exhaust port by high-speed air jet flow generating nozzles arranged at various places in the parking lot. It is also Hei 7-318 1 2
Regarding 4 “Blower Unit”, a blower device suitable for generating such a high-speed air jet stream has been proposed. As a method of controlling the operation of the blowing unit,
It has been proposed to measure the concentrations of CO and CO2 in a parking lot and to control the operation of a ventilation unit of the entire facility according to the detected value.

[0004]

However, according to the technology proposed in the prior art, for example, the airflow path in a parking lot is divided into certain zones, and only the zones that really need ventilation are ventilated with a ventilation unit. Separately, it is necessary to install a sensor that detects the passage of the vehicle, and it is necessary to pay attention so that the installation work at that time does not hinder the traffic of the vehicle. Further, even when controlling the operation of each blower unit, it is necessary to set an operation control unit for separately performing system control somewhere separately from the blower unit. Furthermore, the method of measuring the concentration of CO and CO _{2 in} the parking lot and controlling the operation of the ventilation unit of the entire facility according to the detected value requires installing an expensive concentration measuring device in an optimal place.
In addition, there is a problem that the response delay is large and the control is not actually performed.

[0005] The present invention has been made in view of such a point, and as described above, the air flow path in the parking lot is divided into certain zones, and when ventilating only those zones that truly require ventilation, a separate sensor is required. It is an object of the present invention to provide a ventilation unit capable of performing this without providing a device separately from a ventilation unit, and to easily perform system control of the zone, and a ventilation system for an indoor parking lot, and to solve the above problem. .

[0006]

According to the first aspect of the present invention, there is provided a unit disposed in a space above an indoor parking lot, wherein the unit includes a chamber provided with a suction port, and the inside of the chamber. A blower for generating a jet flow provided in the blower unit, wherein the gas sucked from the suction port by the operation of the blower is configured to be blown out from a nozzle attached to the chamber; A detecting device for detecting a vehicle passing below the vehicle, and a transmitting device for transmitting an operation signal for operating a blower of another blowing unit, and when the detecting device detects the passage of the vehicle, the detecting device detects the vehicle. A blower unit, wherein the blower of the blower unit having the blower operates and an operating signal is transmitted from the transmitting device. It is.

[0007] According to such a blower unit, since the unit itself disposed in the space above the indoor parking lot is provided with the detecting device for detecting the vehicle passing below the unit,
There is no need to provide a separate detection device. And the unit is
Since it is located in the space above the indoor parking lot, it does not hinder the traffic of vehicles. And when this detection device detects the vehicle, the blower operates and sends an operation signal to operate the blowers of other blower units.Therefore, the control unit that controls the operation of each blower unit is separate from the unit. There is no need to provide.

Here, as the detecting device, for example, infrared rays,
It is possible to use an object detection sensor that uses light and ultrasonic waves, and for the operation signal of the transmitting device, of course, it is possible to use a wired method using a cable, but to use a wireless method using infrared, light, and radio waves This eliminates the need for wiring and other construction work.

In the above-mentioned blower unit, as described in claim 2, after the start of the operation of the blower,
If the blower is automatically stopped after a predetermined time has elapsed, that is, if a so-called timer function is provided, appropriate automatic operation can be performed without involvement of personnel, thereby contributing to labor saving and energy saving.

[0010] Further, it is more preferable that the operating time of the blower is extended when the detecting device detects the passage of another vehicle during the operation of the blower. For example, if the function of the timer is configured so that the blower is operated for a predetermined time from when the detection device detects the last time, the desired blowing operation can be performed in response to a frequently passing vehicle. it can.

According to a fourth aspect of the present invention, there is provided a blower unit including a detecting device for detecting a vehicle passing below the chamber and a receiving device for receiving an operation signal from another blower unit. When detecting, and when receiving an operation signal from the other blowing unit by the receiving device, a blowing unit having the detecting device
It is constructed as blower is operated, yet the other feed
Activate the blower of a blower unit different from the wind unit
A transmitting device for transmitting an operation signal, wherein the detecting device
Therefore, when the passage of the vehicle is detected, and the receiving device
Therefore, the operation signal from the other blower unit was received.
Sometimes, the blower of the blower unit having the detection device is
Activates and sends an activation signal from the transmitter
It is characterized by having been constituted as follows.

According to the blower unit of the present invention, the blower operates not only when the detecting device provided in the blower unit detects the vehicle but also when the receiving device receives an operating signal from another blower unit. It is supposed to.

[0013]

[0014] Then, according to the blower unit of claim 4,
Not only does the blower operate when the detection device provided in the device itself detects the operation or receives an operation signal from another blowing unit, but also transmits an operation signal from the transmitting device to another blowing unit.

[0015] In the above blower unit of claim 4 ,
As with blower unit according to claim 2 already described, to impart an appropriate timer mechanism, after work dynamic initiation of the blower, automatically blower after a predetermined time elapses may be configured to stop. Further, in this case, as described in claim 6 , the operation time of the blower is extended when the detection device detects the passage of another vehicle or the reception device receives the operation signal during the operation of the blower. According to this structure, a desired air-blowing operation can be performed corresponding to a frequently passing vehicle, as in the case of the third aspect.

According to a seventh aspect of the present invention, as a ventilation system for an indoor parking lot using the blower unit according to each of the above claims, an air supply port for supplying air to the parking lot and an atmosphere in the parking lot are exhausted. a system for ventilating an indoor parking having an exhaust port, also claim 1,2,3,4,5
Is a blower unit according to any one of 6, that air flow ejected from the nozzle which is disposed, in the space above the parking area to form a plurality of air flow path toward the exhaust port from the air inlet A ventilation system is provided that features.

According to claim 8 , claims 1, 2,
The blower unit according to any one of 3, 4, 5, or 6 ,
It is arranged in the upper space in the parking lot so that the air flow ejected from the nozzle forms a plurality of air flow paths from the air supply port to the exhaust port, and the detection device of one of the air blowing units in these air blowing units passes A ventilation system for an indoor parking lot, wherein when a vehicle is detected, a blower of another blower unit existing in the same airflow path as the one blower unit is operated.

The ventilation unit used in the ventilation system of each of the indoor parking lots is described in claims 1, 2, 3, 4,
The blowing units described in 5 and 6 may be used in appropriate combination.

According to the ventilation system of the seventh and eighth aspects, it is possible to detect the passage of a vehicle, and to carry out intensive ventilation of an airflow path and a zone which really need ventilation. It is not necessary to provide the detection device separately from the blower unit, and it is not necessary to separately construct a system control for centralized ventilation of the zone.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a blower unit 1 according to the present embodiment, FIG. 2 is a side view, and FIG. FIG. 2 is a perspective view of the blower, and the blower unit 1 includes a centrifugal blower 3 in a chamber 2 having a substantially square box shape as a whole. The rear side plate 4 of the chamber 2 is made of, for example, a lattice mesh, and forms an air inlet. Chamber 2
Are provided with sound absorbing members 5 made of, for example, glass wool and glass cloth.
Is emitted by the sound absorbing material 5.

The discharge port 3a of the blower 3 and the chamber 2
A suitable distance is provided between the discharge port 3a and the inner surface of the front plate 6 by a partition plate 7 that partitions the inside of the chamber 2 back and forth with respect to the discharge port 3a. , A dynamic pressure chamber S is formed.

At the center of the outer surface of the front side plate 6 detachably attached to the chamber 2, a dynamic pressure chamber S in the chamber 2 is provided.
For example, a hollow flexible support 8 having flexibility and constituted by a flexible duct is provided, and a tapered nozzle 9 is provided at the tip of the flexible support 8. With such a configuration, the blower 3
When is operated, the surrounding air is sucked in from the rear side plate 4 and is discharged as a jet from the nozzle 9 through the dynamic pressure chamber S from the discharge port 3 a of the blower 3.

A vehicle sensor 11 as shown in FIGS. 2 and 3 is provided on the lower surface of the chamber 2. The vehicle sensor 11 is a sensor that detects a vehicle by a so-called ultrasonic method. As shown in FIG. 4, the vehicle sensor 11 receives a transmitting unit 11a and a reflected wave when the vehicle is detected to detect the presence of the vehicle. And a receiving unit 11b. Note that the vehicle sensor 11
It is itself covered with an appropriate cover.

Further, on the lower surface of the chamber 2, there are provided a transmitting device 12 for transmitting an operation signal for operating a blower of another blowing unit, and a receiving device 13 for receiving an operating signal from another blowing unit. ing. The transmitting device 12 is configured to transmit an infrared signal to the surroundings, and the receiving device 13 is configured to receive an infrared signal from another blowing unit.

A control unit 21 having a control device shown in FIG. 4 and other circuit devices is mounted on, for example, a side surface of the chamber 2. Needless to say, the control unit 21 can be provided at an arbitrary position of the blower unit 1 due to wiring and the like. The control by the control unit 21 is as follows.

That is, when the vehicle sensor 11 detects a vehicle, a detection signal is input from the detection circuit unit 23 to the central control unit 24 of the control unit 21 as shown in FIG. An operation signal is output to the controller. As a result, the blower 3 is operated, and as described above, the surrounding air is sucked from the rear side plate 4 and the discharge port 3a of the blower 3 is discharged.
From the nozzle 9 through the dynamic pressure chamber S.

When the detection signal is input to the central control unit 24, a transmission start signal is output to the transmission circuit unit 25 of the transmission device 12, and the transmission circuit unit 25 receiving the transmission start signal outputs The transmitting device 12 transmits an infrared signal, which is a predetermined operation signal. The receiving device 13 includes
The receiving circuit unit 26 is connected, and when the receiving device 13 receives an operation signal from another blowing unit, outputs an appropriate signal based on the operation signal to the central control device 24. In response to this, an operation signal is output to the blower 3.

Further, the central control unit 24 is provided with a timer circuit, which outputs an operation signal to the blower 3 and then outputs a stop signal to the blower 3 after a predetermined time has elapsed. The blower 3 is stopped by the stop signal. However, even when the blower 3 is operating, the vehicle sensor 1
1. The receiving device 13 is in an ON state, and while the vehicle sensor 11 has already detected the vehicle and the blower 3 is operating, if another vehicle is detected or an activation signal is received, The counting is restarted again from that time. That is, the timer circuit and the like are configured such that the predetermined time is counted last when the vehicle is detected last or when the receiving device 13 receives the operation signal. The predetermined time can be set arbitrarily.

The blower unit 1 according to the present embodiment has the above-described configuration. Next, an example of use will be described. First, as shown in FIG. 5, the blower unit 1 is installed in a space above an indoor parking lot such as an underground parking lot. In the example of FIG. 5, an appropriate suspension means 3 such as a suspension bolt is used.
1 hangs on the ceiling 32 of the underground parking lot X. Then, for example, the other blower units 41 and 42 having the same configuration as the blower unit 1 are suspended so as to be located in front of the jet discharged from the nozzle 9 of the blower unit 1. Further, each vehicle sensor 11 of each blower unit 1, 41, 42 is arranged so as to detect a vehicle M passing below it, and the transmitting device 1 of the blower unit 1
2 is transmitted to the receiving device 13 of the blower unit 41.
And the transmitting device 1 of the blowing unit 41
2 is arranged to be received by the receiving device 13 of the blower unit 42.

As described above, each of the blower units 1, 41, 42
In the case where the vehicle M moves below the blowing units 1, 41 and 42 in the direction from the blowing unit 1 to the blowing unit 42 as shown in FIG. 5, for example, as shown in FIG. When the vehicle sensor 11 of the blower unit 1 detects the vehicle M, the central control device 24 outputs an operation signal to the blower 3, the blower 3 of the blower unit 1 is operated, and the surrounding air is sucked to Nozzle 9
From the air blow unit 41 as a jet.

At this time, the central control unit 24 operates the transmitting device 1
Since the transmission start signal is output to the transmission circuit 25 of the second transmission circuit 25, the transmission circuit 25 to which the transmission start signal is input is
A predetermined operation signal is transmitted from the transmitting device 12 to the blowing unit 31. In response to this, the blower of the blower unit 41 operates, and at the same time, an operating signal is transmitted from the transmitting device 12 to another blower unit 42. Therefore, the blowers of the blower units 1, 41, 42 operate one after another, and the vehicle M
The air contaminated by the exhaust gas and the like generated from the air is guided and conveyed one after another by these blower units 1, 41 and 42. Then, even after the vehicle M has passed, the blowers of the blower units 1, 41, and 42 continue to operate until a predetermined time has elapsed by the operation of the timer circuit.

In this case, if the timer circuit is operating, that is, while the blowers of each of the blower units 1, 41, and 42 are operating, when the passage of another vehicle is detected or an operation signal is received, the predetermined time is restarted from that time. The count starts.

As described above, when the blower units 1, 41, 42 according to the present embodiment are used, the operation is started according to the passage of the vehicle without using a separate vehicle sensor.
Further, since the vehicle sensor 11 is attached to the blower units 1, 41, and 42 suspended from above, there is no need to separately provide this kind of sensor, and the vehicle sensor 11 can be installed at the same time when the blower unit is attached, which is extremely simple. Construction can be performed. Moreover, it does not obstruct the traffic of the vehicle. In addition, since the blower units 1, 41, and 42 have a function of operating other blower units, system control of each blower unit can be performed without providing a separate control unit. The function of the timer circuit enables efficient operation without waste.

Next, a ventilation system utilizing the features of the blower units 1, 41, 42 according to the present embodiment will be described. FIG. 6 shows a plan view of an underground parking lot X to which the ventilation system is applied.
The vehicle has an entrance / exit zone 51 on one side thereof, and an air supply fan 52 and an exhaust fan 53 are installed on both sides of the entrance / exit zone 51. The parking area P of the vehicle M is defined by appropriate partition walls 54, 55, 56, 57, 58. In the example of FIG. 6, parking areas P ₁ and P ₂ provided opposite to each other and a parking area P ₃ provided along a wall facing the entrance / exit zone 51.
Are formed.

When ventilating the underground parking lot X having such a configuration, the air supply from the air supply fan 52 is efficiently and without stagnation near the ends of the parking areas P ₁ , P ₂ and P _3. It is necessary to allow the air to flow and finally to the exhaust fan 53. In that case, it is desirable to provide ventilation efficiently and in consideration of energy saving. According to the present invention, such a request can be satisfied by arranging the blower unit 1 as shown in FIG.

That is, the ventilation units 61, 62, 63, 64, 65, 66, and 67 having the same configuration as the ventilation unit 1 are mounted on the ceiling of the underground parking lot X so as to be arranged as shown in FIG. _1, to implement the ventilation zone P _2, blower unit blower unit 61,62,6
3, 64, 65 are mounted above the passage of vehicles entering and exiting the parking areas P ₁ , P _2.
In order to perform ventilation in zone ₃ ,
The 6,67 attached to the passages above the vehicle in and out of the parking area P _3.

As described above, each of the blower units 61, 62, 6
By placing the 3,64,65,66,67, for example, to park in the parking area P _1, P _2, when there is a starting vehicle M1, M2 from the parking area P _1, P _2,
When passing through the passage, the blowing units 61, 62, 6
3, 64 vehicle sensors 11 detect the passage of the vehicles M1, M2, actuate the blower, and transmit an actuation signal to another blower unit in the system of the airflow. For example, when the blower unit 61 first detects passage of the vehicle M1, the blower of the blower unit 61 itself operates, and an infrared signal, which is an operation signal, is transmitted from the transmitter 12 of the blower unit 61 to the surroundings.

Then, the receiving device 13 of the blower unit 62 receives the operation signal, the blower of the blower unit 62 itself is operated, and an infrared signal as an operation signal is transmitted from the transmitter 12 of the blower unit 62 to the surroundings. . In this manner, the respective blowers 3 of the blower units 63, 64, and 65 also operate one after another. As a result, the flow of the airflow as indicated by arrows in FIG.
The atmosphere in the zone of the parking area P ₁ is efficiently ventilated by the induced transport flows 63, 64 and 65, and is guided to the exhaust fan 53.

At this time, the infrared signal, which is an operation signal from the blower unit 61, is cut off by the partition wall 54, and similarly, the operation signals from the blower units 63, 64 are
Blocked by 6. Therefore, the air blowing unit to implement the ventilation zone of the parking area P ₃ 66 and 67
Does not receive these operation signals, and the blower 3 of the blower units 66 and 67 does not operate.
Therefore, ventilation is performed only in a zone where ventilation is really required, so that efficient and energy-saving ventilation can be performed. Similarly, the vehicle M3 parking area P ₃
When the vehicle enters and exits, the blowers of the blower units 66 and 67 operate.

By arranging the blower units using the partition walls in this way, even if the operation signal is a signal having no directivity, it is possible to suitably control the system of each blower unit. Of course, if the operation signal is given directivity in advance and the transmission / reception relation of the operation signal is systematized, it is possible to perform ventilation only in a zone that really needs ventilation regardless of the partition wall.

In the blowing unit 1, the transmitting device 12 and the receiving device 13 are configured to transmit and receive an infrared signal. However, instead of this, a device configuration using an appropriate light beam as a signal medium is adopted. Alternatively, a weak radio wave may be used as a signal medium as in the blower unit 71 shown in FIGS. 7, 8 and 9. Note that the blower unit 71
, Members and the like denoted by the same reference numerals used in the blower unit 1 according to the embodiment indicate members having the same configuration and function.

That is, this blowing unit 71 is provided with a transmitting circuit unit 27 and a receiving circuit unit 28 for weak radio waves instead of the transmitting circuit unit 25 and the receiving circuit unit 26 of the blowing unit 1, and transmission and reception are performed by an antenna member 29. It is configured to do so.

As with the blower unit 1, the blower unit 71 having such a structure is also provided with appropriate suspending means 31 such as hanging bolts, as shown in FIG.
It may be used by hanging it on the ceiling 32 of an underground parking lot or the like. That is, the other blower units 72, 73 having the same configuration as the blower unit 71 are suspended so as to be located in front of the jet flow discharged from the nozzle 9 of the blower unit 71, and the respective blower units 71, 72, Each of the vehicle sensors 11 is disposed so as to detect a vehicle M passing therethrough.
9 is received by the antenna member 29 of the blowing unit 72, and the operating signal from the antenna member 29 of the blowing unit 71 or 72 is received by the antenna member 29 of the blowing unit 73. So that

With this arrangement, when the vehicle M moves below the blower units 71, 72, 73 in the direction from the blower unit 71 to the blower unit 73, as in the case of the preceding blower units 1, 41, 42, the blower unit 71, 7
Each of the blowers 2 and 73 is operated to suck the surrounding air and transport it from the blower unit 71 to the blower unit 73.

[0045]

According to the blower units of claims 1 to 6 ,
It is possible to detect a passing vehicle and operate the blower without installing a separate vehicle detection device. In addition, the unit itself is arranged in the space above the indoor parking lot, and does not hinder the traffic of the vehicle. Also, there is no need to provide a control unit for controlling the operation of each blowing unit separately from the units. Further, in the blower unit according to the second and fifth aspects provided with a timer function, appropriate automatic operation can be performed without involvement of personnel, which contributes to labor saving and energy saving. Further, according to the blower unit according to claims 3 and 6 , when the detecting device detects the vehicle during the operation of the blower or receives an operation signal, the operation time of the blower is extended correspondingly. Desired air blowing operation can be performed according to the passing vehicle. According to the blower unit of claim 4, since the blower operates not only when a vehicle is detected but also when an operation signal from another blower unit is received, an operation control unit is not separately provided. It is easy to construct a ventilation system in combination.

Since the ventilation system according to claims 7 and 8 is a ventilation system for an indoor parking lot constructed using such a ventilation unit according to claims 1 to 6 , it detects the passage of a vehicle,
It is possible to implement intensive ventilation of the airflow path and zone that truly needs ventilation, and it is not necessary to provide a detection device for vehicle detection separately from the ventilation unit, and to perform intensive ventilation of the zone. There is no need to separately construct system control.

[Brief description of the drawings]

FIG. 1 is a plan view of a blower unit according to an embodiment of the present invention.

FIG. 2 is a side view of the blower unit of FIG.

FIG. 3 is a perspective view of the blower unit of FIG. 1;

FIG. 4 is an explanatory diagram illustrating a circuit configuration of the blower unit of FIG. 1;

FIG. 5 is an explanatory view showing an example of attachment of the blower unit of FIG. 1;

FIG. 6 is an explanatory plan view of a ventilation system of an underground parking lot using the blower unit of FIG. 1;

FIG. 7 is a side view of a blower unit according to another embodiment.

FIG. 8 is a perspective view of the blower unit of FIG. 7;

FIG. 9 is an explanatory diagram illustrating a circuit configuration of the blower unit of FIG. 7;

FIG. 10 is an explanatory view showing an example of attachment of the blower unit of FIG. 7;

[Explanation of symbols]

1, 41, 42, 61, 62, 63, 64, 65, 6
6, 67 Blowing unit 2 Chamber 3 Blower 8 Flexible support 9 Nozzle 11 Vehicle sensor 12 Transmitting device 13 Receiving device X Underground parking lot

Claims (8)

(57) [Claims] 1. A unit arranged in a space above an indoor parking lot, comprising: a chamber in which a suction port is formed; and a blower provided in the chamber to generate a jet, the operation of the blower In the blower unit configured so that the gas sucked from the suction port is blown out from a nozzle attached to the chamber, a detecting device for detecting a vehicle passing below the chamber and another blower unit A transmission device for transmitting an operation signal for operating the blower, wherein when the detection device detects the passage of the vehicle, the blower of the blower unit having the detection device is activated, and an operation signal is transmitted from the transmission device. A blower unit, characterized in that the blower unit is configured to: 2. The blower unit according to claim 1, wherein the blower is configured to automatically stop after a predetermined time has elapsed after the start of operation. 3. The blower unit according to claim 2, wherein the operating time of the blower is extended when the detecting device detects the passage of another vehicle during the operation of the blower. . 4. A unit disposed in a space above an indoor parking lot, comprising: a chamber having a suction port formed therein; and a blower provided in the chamber to generate a jet flow. In a blower unit configured so that gas sucked from the suction port is blown out from a nozzle attached to a chamber, a detection device that detects a vehicle passing below the chamber and another blower unit A receiving device for receiving an operation signal of the vehicle, wherein when the detection device detects the passage of a vehicle, and when the receiving device receives an operation signal from the other blowing unit, the detection is performed. Blow unit with device
The air blower of the air conditioner is configured to operate, and the air blower of another air blower unit is different from the other air blower unit.
A transmitter for transmitting an operation signal for operating the blower.
When the detection device detects the traffic of the vehicle,
And by the receiving device from the other blower unit
When receiving the activation signal, the air blower having the detection device
When the blower of the unit is activated,
An air blowing unit, characterized in that it is configured to emit an activation signal . 5. After a predetermined time has passed after the blower has started operating.
The blower unit according to claim 4 , wherein the blower unit is configured to stop automatically after a short time. 6. When the blower is in operation, the detecting device detects that another vehicle is in operation.
When a traffic signal is detected or the receiving device receives an activation signal
Sometimes the blower is configured to extend its operating time
Characterized in that it, blower unit according to claim 5. 7. An air supply port for supplying air into a parking lot,
Indoor parking lot having an exhaust port for exhausting the atmosphere in the car park
A system for ventilating air, comprising: a pump according to any one of claims 1, 2 , 3, 4, 5 or 6.
The air flow emitted from the nozzle of the wind unit is
Create multiple airflow paths from the air supply port to the exhaust port
Characterized by being arranged in the upper space in the parking lot,
Indoor parking ventilation system. 8. A system for ventilating an indoor parking lot having an air supply port for supplying air into the parking lot and an exhaust port for exhausting an atmosphere in the parking lot, wherein the system is for ventilating an indoor parking lot. The blower unit according to any one of Claims 4, 5, and 6 , is arranged in the upper space in the parking lot so that the air flow ejected from the nozzle forms a plurality of air flow paths from the air supply port to the exhaust port. Installed , these blower units
Detection device of one blower unit detects passing vehicles
The same airflow path as the one blower unit
Configured to operate the blower of another existing blower unit
And characterized in that was, indoor parking ventilation system.