JP2005009801A - Gas supply and discharge ventilation fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas supply and discharge ventilation fan suitable for constant ventilation at low manufacturing cost, low noise, and low power consumption achieved by simplified constitution. <P>SOLUTION: An axial flow type separate gas discharge blower 11 is incorporated in a discharge gas space part 2 in a main body case 4 forming the discharge gas space part 2 and a supply gas space part 3 that are separated from each other. A multi-blade type separate supply gas blower 12 is incorporated in the supply gas space part 3. Air in the room is sucked by the discharge air blower 11 to be discharged out of the room, while air outside the room is sucked by the supply gas blower 12 to be supplied into the room. Both the simultaneous operation of the discharge gas blower 11 and the supply gas blower 12 and the separate operation of them can be performed. The direction of the rotation axis is set horizontal for both the discharge gas blower 11 and the supply gas blower 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a supply / exhaust ventilation fan that performs exhaust of indoor polluted air to the outside of the room and supply air for taking in the outdoor air into the room.
[0002]
[Prior art]
In a conventional supply / exhaust ventilation fan, a multi-blade type blade is mounted on the rotating shaft of a single motor of both shafts type, and each blade is covered with a fan casing to constitute an exhaust fan and an air supply fan. The exhaust blower and the air supply blower are operated simultaneously, and the ventilation operation by simultaneous supply and exhaust is performed. In some of these, the exhaust flow and the supply air flow are passed through a heat exchanger, and heat exchange is continuously performed between the supply and exhaust flows. In addition, regarding this type of prior art, there is a technique disclosed in Patent Document 1.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 05-033979 [0004]
[Problems to be solved by the invention]
In a conventional supply / exhaust ventilation fan, since each blade of the exhaust blower and the supply blower is rotated simultaneously by a single motor, it is necessary to select a motor having a capacity suitable for it. Rotating the blades of the exhaust air blower and the air supply blower with individual motors can be inexpensive for each motor, and as a result, the life of each motor can be extended. In addition, in a double-shaft motor, the exhaust part on the exhaust side has a positive pressure, the suction part on the supply side has a negative pressure, and the motor straddles between them. Airtightness is difficult to maintain, and the structure for airtightness is troublesome. In the partition structure that separates the supply air and the exhaust gas, if the heat exchange is not performed, if the temperature difference between the supply and exhaust air flows is large, it is necessary to adopt a heat insulating structure for condensation, and the structure becomes complicated. Moreover, in a highly airtight house, it is installed for the purpose of discharging harmful chemical substances and is always ventilated. However, conventional air supply and exhaust fans have high noise and power consumption, and the main body itself is large.
[0005]
The present invention has been made in order to solve the conventional problems, and the object of the present invention is to promote the reduction of the manufacturing cost by simplifying the structure of the supply / exhaust ventilation fan. It is to obtain an air supply / exhaust ventilation fan suitable for low-noise, power-saving, and continuous ventilation, and to improve the usability and function of the air supply / exhaust ventilation fan.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention incorporates an independent exhaust fan of an axial flow type or a diagonal flow type into an exhaust space portion of a main body box that defines an exhaust space portion and an air supply space portion independent of each other, Incorporate a multi-blade independent air supply blower in the air supply space, inhale indoor air with the exhaust air blower and exhaust it to the outside, and inhale outdoor air with the air supply air blower and supply it into the room Adopt means to configure.
[0007]
By adopting the above means, the exhaust space portion and the air supply space portion can ensure airtightness and heat insulation by the structure of the main body box body without providing any special structural member. The exhaust can be performed by a low noise exhaust blower with low static pressure and low power consumption suitable for a large air volume, and the air supply can be performed by a medium static pressure and medium air flow with low power consumption. Can do.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an exploded perspective view of a supply / exhaust ventilation fan according to the present embodiment, FIG. 2 is a longitudinal front view of the same, FIG. 3 is a longitudinal side view of the exhaust space side shown in the same installation state, and FIG. FIG. 5 is a perspective view showing the entire supply / exhaust ventilation fan. In this air supply / exhaust ventilation fan, functional parts are incorporated in a main body box 4 made of an integrally molded resin having an independent exhaust space portion 2 and an air supply space portion 3 that are partitioned from each other by a central partition wall 1. (See FIG. 2). The front face of the main body box 4 is open, and a front grille 5 made of resin having a rear structure that is individually connected to the exhaust space portion 2 and the air supply space portion 3 can be attached to and detached from the front face of the main body box body 4. It is installed.
[0009]
The back surface of the main body box 4 is closed by a back structure 6. In the center of the back structure 6, a round hole divided into right and left by the partition wall 1 is formed. One of the round holes communicates with the air supply space 3 and functions as an intake port 7 for supply of air, and the other of the round holes communicates with the exhaust space 2 and functions as an exhaust outlet 8 for exhaust. A rectangular air supply outlet 9 and a rectangular exhaust air inlet 10 are provided side by side at a front upper portion of the front grill 5 so as to be separated from the partition wall 1. This prevents a short circuit between the supply / exhaust flow as well as the direction of the airflow. An axial flow type exhaust blower 11 is incorporated in the exhaust space portion 2, and a multi-blade air supply blower 12 is incorporated in the air supply space portion 3.
[0010]
In the exhaust blower 11 and the supply blower 12, the rotation shafts of the drive motors 13 and 14 are provided horizontally on substantially the same line, and axial flow blades 15 and multiblade blades 16 are mounted on the respective rotation shafts. The axial flow blade 15 of the exhaust blower 11 is located on the suction side, and the drive motor 13 is located on the blowout side. The exhaust blower 11 is provided with a fan casing 17 that covers the axial flow blade 15 and the drive motor 13. The fan casing 17 has a cylindrical structure 18 that covers the outer peripheral portion of the axial flow blade 15 up to the rear edge thereof, and a blowout guide that is connected to the cylindrical structure 18 and covers the outer shell of the drive motor 13 and is directed to the outlet 8 in the radial direction. And a cover structure 20 having 19. The cylindrical structure 18 is fitted and attached to the end of the cover structure 20 attached to the partition wall 1 so as to be detachable by an axial operation. The lowermost end surface of the blowout guide 19 is substantially at the same position as the lower end surface of the blowout port 8. A bell mouth 21 having an inner diameter of about 70% of the outer diameter of the axial flow blade 15 is formed at one end of the cylindrical structure 18 in the fan casing 17 and serves as a suction port for the exhaust blower 11. The drive motor 13 of the exhaust blower 11 can be operated with strength by notch switching and can be operated / stopped independently.
[0011]
The drive motor 14 of the air supply blower 12 is attached to a motor fixing plate 22 provided integrally with the air supply space 3 by sliding from the front side to the back side and screwing the outer shell. The driving motor 14 of the air supply blower 12 can also be operated by notch switching and can be operated / stopped independently. The multiblade blade 16 attached to the rotating shaft of the drive motor 14 is housed in a fan casing 23 made of foamed polystyrene. The lowermost end surface of the fan casing 23 of the air supply blower 12 is substantially in the same position as the lower end surface of the air intake inlet 7 provided on the back surface of the main body box 4.
[0012]
A frame element 25 forming a part of a holder for mounting the air filter 24 is formed by integral molding on the suction port surface of one end of the fan casing 23, and a sound absorbing material 26 is pasted on the inner surface of the air outlet portion. ing. Another frame element 27 is coupled to the frame element 25 to form a square holder that fits in close contact with the space portion of the air supply space 3 facing the partition wall 1. The holder is provided with an opening on the back surface that communicates with the suction port 7 of the main body box 4, and a filter mounting port 28 is provided on the front surface. A filter frame 29 that can be inserted into and removed from the front surface of the filter mounting port 28 is mounted, and air sucked from the suction port 7 is filtered in the front stage of the air supply blower 12 by an air filter 24 that is detachably fitted to the filter frame 29 ( (See FIG. 1).
[0013]
The lowermost end surface of the holder is substantially at the same position as the lower end surface of the suction port 7, and a drain hole 30 leading to the holder is provided in the portion of the suction port surface of the fan casing 23. The filter frame 29 housed in the holder can be maintained and replaced while the front grille 5 is mounted by opening and closing the open / close lid 31 provided on the front surface of the front grille 5. In addition, air leakage at the fitting portion between the filter frame 29 and the holder is prevented by a double structure together with the packing material provided on the filter frame 29 by the opening / closing lid 31. For the air filter 24, for example, a high-performance material is used for the purpose of removing pollen, and if the invasion of insects or the like is prevented, the non-woven fabric or the saran net has a relatively small pressure loss and is not easily clogged. Use things. Further, a heat insulating material is affixed to the inside of the fan casing 23 of the motor fixing plate 22 or the opposite side, and is combined with the fan casing 23 and the holder integrally formed of foamed polystyrene. It has a completely insulated structure. In addition, a cushion material for preventing air leakage is attached to these joint portions as necessary. This is because air leakage leads to the occurrence of condensation and causes problems.
[0014]
In the upper part on the back side of the exhaust space 2 of the main body box 4, as shown in FIG. 3, an electrical component storage portion 32 is provided in a space surrounded by the fan casing 17 of the exhaust blower 11 and the upper inner wall of the main body box 4. Is provided. The electrical component storage unit 32 stores electrical components such as quick connection terminals. In addition, in the upper part on the back side of the air supply space 3, as shown in FIG. 4, an electrical component storage portion 33 is provided in a space surrounded by the fan casing 23 of the air supply fan 12 and the upper inner wall of the main body box 4. Is provided. The electrical component storage unit 33 stores electrical components such as capacitors. By adopting such a configuration, even if rainwater enters from the suction port 7 or the outlet 8 on the back of the main body box 4 and leaks into the air supply space 3 or the exhaust space 2, the suction port 7 or Since there are the electrical component storage portions 32 and 33 above the air outlet 8, water is not splashed on the electrical components. The electrical component storage portion 32 provided in the exhaust space 2 has a larger volume because the exhaust blower 11 is a more compact axial flow type than the supply air blower 12, and more important electrical wiring such as quick connection terminals is provided. The electrical component which has is accommodated. Further, since there is no condensation due to the exhaust space portion 2, electrical components that are vulnerable to condensation are also stored in the electrical component storage portion 32.
[0015]
The suction port 7 and the air outlet 8 on the back surface of the main body box 4 are provided with sliding door type opening / closing shutters 34 for opening and closing each. The opening / closing shutter 34 of the suction port 7 is interlocked with the air supply blower 12 by a switch 35, and the opening / closing shutter 34 of the air outlet 8 is interlocked with the exhaust air blower 11 by a switch 36. Each open / close shutter 34 is housed in a space provided in the portion of the air outlet 8 and the air inlet 7 and is pressed from the back side by a back plate 37. A heat insulating material is attached to the entire back surface of the back plate 37 to prevent condensation at this portion. Each open / close shutter 34 is provided with an operation knob 38 at the lower end thereof, and is drawn out from a slit formed in the lower surface of the main body box 4. Each of the switches 35 and 36 is provided at a position where the switch operation is performed in the vicinity of the fully closed position of each open / close shutter 34, and the processing air volume can be changed depending on the open / close state of the open / close shutter 34.
[0016]
As shown in FIG. 3, the main body box 4 is attached by a steel plate mounting bracket 39 that is screwed to the wall surface W of the room. The mounting bracket 39 has a round hole in the center, and is provided with a hook 40 that can be hooked in the upper locking hole on the back side of the main body box 4 at the top. A projecting portion 41 that fits into the lower rear portion of the main body box 4 is provided at the lower portion, a hook 40 is hooked on the locking hole, and a screw 42 is inserted into the screw hole of the projecting portion 41 from the lower surface of the main body box 4. By tightening, the main body box 4 is attached to the wall surface W of the room. A connecting flange 43 is inserted into the round hole of the mounting bracket 39, and the mounting bracket 39 is hooked by a flange portion of the connecting flange 43 with a packing material interposed therebetween. The connection flange 43 has a partition wall in the center, and has an air supply path and an exhaust path communicating with the suction port 7 and the air outlet 8 on the back surface of the main body box 4. This connection flange 43 is connected to a double-layer pipe ventilation duct 44 having a cylindrical shape and a partition in the center embedded in a circular ventilation hole provided through the wall with a downward slope.
[0017]
The supply / exhaust ventilation fan can perform simultaneous supply / exhaust operation only for supply or exhaust, and the processing air volume of supply / exhaust can be individually determined by the opening / closing state of the opening / closing shutter 34 and each changeover switch (not shown). Can be changed. As shown in FIG. 2, when the exhaust-side open / close shutter 34 closes the outlet 8, the switch 36 is off and the exhaust blower 11 is stopped. On the other hand, when the air supply side opening / closing shutter 34 opens the suction port 7, the air supply blower 12 is operated and sucks outdoor air from the suction port 7, and is provided on the upper right side of the front grill 5. The air is blown out slightly upward from the air supply outlet 9 into the room. At this time, the air sucked from the suction port 7 is sucked into the fan casing 23 through the air filter 24 held by the holder. Therefore, there is little adhesion of dirt to the multi-blade blade 16 which is easily adhered and difficult to clean, and maintenance of the air supply blower 12 is easy. Although the blowing side noise of the air supply blower 12 is larger than the suction side noise, since the sound absorbing material 26 is pasted in the vicinity of the blowing portion of the fan casing 23, not only a quiet air supply is performed, but also the fan It is also possible to prevent the condensed water that has entered the casing 23 from being blown out as large particles.
[0018]
In the state shown in FIG. 2, when the operation knob 38 of the exhaust opening / closing shutter 34 is operated to move the opening / closing shutter 34 leftward in FIG. 2 to the position of the broken line, the exhaust outlet 8 is fully opened, and the switch 36 Is turned on and the exhaust blower 11 is operated. However, the position is set so that the switch 36 is turned on when the open / close shutter 34 is in a half-open state. When the exhaust blower 11 is operated, indoor air is sucked from the suction port 10 on the upper side of the front grill 5 and sucked from the bell mouth 21 to the rotating fan casing 17 of the axial flow blade 15. Then, the blowing direction is bent at a substantially right angle by the blowing guide 19 of the cover structure 20 on the drive motor 13 side, and the air is exhausted from the outlet 8 on the back surface of the main body box 4 to the outside through the two-layer pipe ventilation duct 44.
[0019]
As shown in FIG. 3, the fan casing 17 of the exhaust blower 11 has a shape similar to the fan casing of a multi-blade blower when viewed from the suction side of the axial flow vane 15. Unlike the elbow fan casing, the air flow can be bent smoothly and the noise is reduced. Further, since the bell mouth 21 having an inner diameter of about 70% of the outer diameter of the axial flow vane 15 is provided on the suction side of the fan casing 17, although the open air volume is lower than that without the bell mouth 21, The pressure rises. The deterioration of the characteristics is small even if the suction port 10 of the front grill 5 is not positioned at the suction port of the fan casing 17, and the discharge side is small because the exhaust outlet 8 is connected to the double-layer pipe ventilation duct 44. Even if it can ventilate enough. This provides ventilation by simultaneous supply and exhaust. Since the air supply blower 12 is a multi-blade type and has a high blown air speed, if the distance between the air outlet 9 and the air inlet 10 is 100 mm or more, the air current blown from the air inlet 9 and the air outlet 10 are provided. Short circuit with airflow sucked in from is difficult to occur.
[0020]
In this state, when the operation knob 38 of the air supply opening / closing shutter 34 is operated to move the opening / closing shutter 34 leftward in FIG. 2 to the position of the broken line, the air supply inlet 7 is fully closed, and the switch 35 is turned off, the supply air blower 12 is stopped, and ventilation is performed only by exhaust. However, since the switch 35 is set to be turned off when the open / close shutter 34 is fully closed, the air supply blower 12 is in operation when the suction port 7 is in a half-open state.
[0021]
As described above, this supply / exhaust ventilation fan can be ventilated only by supply air, exhaust only, or simultaneous supply / exhaust according to the needs of the user or according to the outdoor situation, and the processing air volume related to supply / exhaust also changes. Since it can be used, it is easy to use and suitable for constant ventilation.
[0022]
In the ventilation operation by simultaneous supply / discharge, for example, in the winter, when the room temperature is about 20 ° C and the outdoor temperature is about 0 ° C, dew condensation is likely to occur at the boundary between the indoor air and the outdoor air. Exhaust air and air supply are easy to mix, but in the air supply / exhaust ventilation fan of the present embodiment, the fan casing 23 of the supply air blower 12 and the holder of the air filter 24 have a heat insulating structure, so there is no risk of condensation. Since the air supply space 3 and the exhaust space 2 are defined integrally with the main body box 4, there is no fear of air leakage, manufacturing is easy, and manufacturing cost is reduced.
[0023]
In general, an axial-flow type blower is suitable for specifications with a low static pressure and a large air volume, and dust hardly adheres to the axial flow blade. A small axial flow type blower is driven by a drive motor called a condenser run induction motor, and since the blade load is low, it is driven to rotate around the synchronous speed of the motor, and is operated at a high efficiency point. And it is characterized by very low noise, low power consumption, and long drive motor life.
[0024]
In addition, the multi-blade type blower is suitable for the specifications of medium static pressure and medium air volume, and dust tends to adhere to the multi-blade blades, but the air volume is not decreased and the change in noise is small when static pressure is applied. A small multi-blade type blower is driven by a drive motor called a condenser run induction motor. The blade load is larger than that of the axial flow type and is driven to rotate at a point lower than the synchronous speed of the motor, resulting in low efficiency. Since operating at a point, the maximum blade efficiency is higher than that of the axial flow type, but the power consumption is also higher. Although it is low noise, there is a feature that the blower body is also large.
[0025]
In a supply / exhaust ventilation fan used in a room, an air filter 24 that cleans the outside air taken into the room is also important. The exhaust blower 11 is configured with an axial flow vane 15 that is difficult to get dust and does not require an air filter, the air supply blower 12 is a multi-blade type, an air filter 24 is disposed in front of the multi-blade blade 16, and the multi-blade Dust adhesion to the blades 16 is prevented.
[0026]
By making the axial directions of both the air supply blower 12 and the exhaust blower 11 substantially horizontal, the air passages of the air supply space 3 and the exhaust space 2 are very simple and have a compact configuration. A ventilation fan that rotates two blades with a single motor is expensive because it uses an expensive double-axis motor with a small number of units. The use of two drive motors that are used in large numbers and at low manufacturing costs makes it easier to take measures against air leakage, lowers manufacturing costs, and achieves low noise, power saving, and long life. Since the air supply blower 12 and the exhaust blower 11 can be operated specially, for example, when fog is generated or wind and rain are strong, it is possible to stop the air supply and ventilate only with the exhaust. It will be good.
[0027]
Necessary ventilation airflow is closely related to room temperature as well as the difference in the materials used in the building. For example, since harmful substances generated from building materials, furniture, etc. are generated in large amounts in summer when the temperature is high, a large amount of ventilation air is required. For this reason, changing the processing air volume depending on the opening / closing state of the opening / closing shutter 34 is highly effective in terms of usability. In the present embodiment, for both supply and exhaust, noise increases even when static pressure is increased by reducing the opening area of the inlet 7 and the opening area of the outlet 8 due to the opening / closing state of the opening / closing shutter 34. There are few. Changing the processing air volume depending on the opening / closing state of the opening / closing shutter 34 is also effective in eliminating the feeling of cold air due to the intake of outside air in winter.
[0028]
In addition, since the lowermost end surface of the holder of the air filter 24 is substantially the same position as the lower end surface of the suction port 7, even if rainwater enters during operation such as when fog is generated, the air filter 24 retains water to some extent, The water can be drained from the suction port 7 to the outside. The water that has passed through the air filter 24 and accumulated in the fan casing 23 can also be drained from the holder to the suction port 7 through the drain hole 30. The fact that the lowermost end surface of the fan casing 17 of the exhaust blower 11 is located at substantially the same position as the lower end surface of the blower outlet 8 also causes a similar drainage effect.
[0029]
And since the suction inlet 10 for exhaust and the blower outlet 9 for air supply are arrange | positioned in the front upper part right and left of the main body box 4, the blower outlet 9 of the air supply by the dirt of the wall surface by exhaust air, a curtain, etc. Problems such as being blocked and not being installed can also be resolved. Since the fan casing 17 of the exhaust blower 11 is composed of two parts, a cylindrical structure 18 and a cover structure 20, and the cylindrical structure 18 is fitted and attached to the cover structure 20, the cylindrical structure 18 and the front grille 5 are removed. The axial flow blade 15 can be cleaned. By making the cover structure 20 of the fan casing 17 into an integrally molded product of resin and attaching the drive motor 13 thereto, the cover structure 20 can be fitted into the exhaust space 2 of the main body box 4 as it is. Is good and it is excellent in assemblability.
[0030]
In the embodiment, the supply / exhaust ventilation fan for connecting the two-layer pipe ventilation duct is shown and described, but the present invention can also be applied to a supply / exhaust ventilation fan in which an independent ventilation duct is connected for supply / exhaust. In the embodiment, the exhaust blower 11 has been described as an axial flow blower. However, a mixed flow blower can be applied as the exhaust blower 11. However, with regard to the adhesion of dust, the diagonal flow type drops more than the axial flow type.
[0031]
【The invention's effect】
According to the present invention, it is possible to obtain a supply / exhaust ventilation fan that is simple in structure, low in manufacturing cost, low in noise, and low in power consumption and suitable for continuous ventilation.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a supply / exhaust ventilation fan according to an embodiment.
FIG. 2 is a longitudinal front view of the same supply / exhaust ventilation fan.
FIG. 3 is a longitudinal side view of the exhaust space similarly shown in an attached state.
FIG. 4 is a longitudinal side view of the air supply space similarly shown in a state before installation.
FIG. 5 is a perspective view showing the entire supply / exhaust ventilation fan.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 Exhaust space part, 3 Air supply space part, 4 Main body box, 7 Air inlet, 8 Air outlet, 9 Air outlet, 10 Air inlet, 11 Exhaust air blower, 12 Air supply fan, 15 Axial flow blade, 16 Multiblade blade 17 Fan casing, 18 Cylindrical structure, 19 Blowout guide, 20 Cover structure, 21 Bell mouth, 23 Fan casing, 24 Air filter, 25 Frame element, 26 Sound absorbing material, 30 Drain hole, 32, 33 Electrical component storage part, 34 Open / close shutter.

Claims (17)

An independent exhaust fan of axial flow type or mixed flow type is incorporated into the exhaust space portion of the main body box defining the exhaust space portion and the air supply space portion which are independent from each other, and a multi-blade type is installed in the air supply space portion. An air supply / exhaust fan that incorporates an independent air supply blower, sucks indoor air by the exhaust blower and exhausts the air outside, and sucks outdoor air by the air supply blower and supplies the air into the same room. The supply / exhaust ventilation fan according to claim 1, wherein the exhaust blower and the supply blower can be operated simultaneously or individually. The supply / exhaust ventilation fan according to claim 2, wherein each of the exhaust blower and the supply blower can be switched between strong and weak. It is an air supply / exhaust ventilation fan in any one of Claims 1-3, Comprising: Both the directions of the rotating shaft of an exhaust air blower and an air supply blower were made into the horizontal direction. It is an air supply / exhaust ventilation fan in any one of Claims 1-4, Comprising: The air supply / exhaust ventilation fan which provided the electrical component storage part in the back upper part in a main body box. It is an air supply / exhaust ventilation fan in any one of Claim 1-5, Comprising: The suction inlet for air supply and the blower outlet for exhaust are provided in the back surface of a main body box, and this suction inlet and a blower outlet are provided. An air supply / exhaust ventilation fan provided with an open / close shutter that opens and closes each of the open / close shutters, the open / close shutter of the suction port being interlocked with the operation of the air supply blower, and the open / close shutter of the air outlet being interlocked with the operation of the exhaust blower. The supply / exhaust ventilation fan according to claim 6, wherein each open / close shutter, the air supply blower, and the exhaust blower operate in conjunction with each other in the vicinity of a fully closed position of each open / close shutter. The supply / exhaust ventilation fan according to claim 6 or 7, wherein an air filter is detachably provided between the intake inlet and the outlet. The supply / exhaust ventilation fan according to claim 8, wherein the air filter is housed in a holder to which the air filter can be attached and detached, and the lowermost end surface of the holder is substantially in the same position as the lower end surface of the suction port of the supply air blower. The supply / exhaust ventilation fan according to claim 9, wherein a lowermost end surface of a fan casing of an air supply blower is positioned substantially at the same position as a lower end surface of an intake port for air supply, and air is generated at a portion of the intake port surface of the fan casing. A supply / exhaust ventilation fan connected to the filter holder via a drain hole. It is an air supply / exhaust ventilation fan in any one of Claim 9 or Claim 10, Comprising: The holder was made into the coupling | bonding structure of the frame element made from two polystyrene foams. It is an air supply / exhaust ventilation fan in any one of Claim 1-11, Comprising: The air supply / exhaust ventilation fan which equip | installed the sound absorption material with the inner surface of the blower outlet vicinity of the fan casing of an air supply fan. The supply / exhaust ventilation fan according to any one of claims 1 to 12, wherein the supply / exhaust fan is provided with an air supply outlet and an exhaust suction port spaced apart from the front side of the main body box. Ventilation fan. A supply / exhaust ventilation fan according to any one of claims 1 to 13, wherein the exhaust blower is connected to the cylindrical structure covering the outer peripheral portion of the blade to the trailing edge of the blade, and the outer shell of the motor. Supply / exhaust ventilation fan provided with a fan casing with a cover structure having a blowout guide that covers the air and leads to the blowout port. The supply / exhaust ventilation fan according to claim 14, wherein the lowermost end surface of the blowout guide in the fan casing of the exhaust blower is positioned substantially at the same position as the lower end surface of the blowout port. The supply / exhaust ventilation fan according to any one of claims 14 and 15, wherein a bell mouth having an inner diameter of about 70% of an outer diameter of a blade is provided in a cylindrical structure of a fan casing of an exhaust blower. The supply / exhaust ventilation fan according to claim 14 or 15, wherein the cylindrical structure of the fan casing of the exhaust blower is configured to be detachable from the cover structure by an axial operation.

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