JP2005265265A - Heat exchange type ventilation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchange type ventilation device equipped with a good efficiency with the supply and exhaust air quantities well balanced by precluding clogging in a heat-exchanger caused by bedewing. <P>SOLUTION: The heat exchange type ventilation device is furnished with the heat-exchanger 10 installed in the intersecting position of an exhaust passage 5 formed through an exhaust side blower 4 with a supply passage 9 formed through a supply side blower 8 and a water/moisture capturing means 11 to admit contacting of the air flows in the exhaust passage 5 and the supply passage 9 and able to bedew the water/moisture having undergone heat-exchange and contained in the exhaust air stream and capture it, wherein the water/moisture capturing means 11 is located upstream of the heat-exchanger 10, which precludes clogging of the heat-exchanger 10 due to bedewing, and the heat exchange type ventilation device equipped with a good efficiency is obtained with the supply and exhaust air quantities well balanced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat exchange ventilator provided with a heat exchanger that supplies and discharges indoor air and outdoor air at the same time, collects heat contained in the indoor air, and adds the outdoor air to a supply airflow.

  Conventionally, an air-conditioning ventilation fan using a heat exchanger is known as an example of this type of heat exchange ventilator (see, for example, Patent Document 1).

  Hereinafter, the air-conditioning ventilation fan will be described with reference to FIGS. 9 and 10.

As shown in the figure, an exhaust ventilation passage 105 that connects an indoor suction port 101 and an outdoor discharge port 102 and is provided with an exhaust blade 103 and an electric motor 104, an outdoor suction port 106, and an indoor discharge port 107, And an air supply passage 109 provided with an air supply blade 108 and an electric motor 104, and a heat exchanger 110 provided at the intersection of the exhaust air passage 105 and the air supply passage 109, and an air supply passage of the heat exchanger 110. When the outdoor air temperature is low in winter, a damper 111 is provided that refracts when the outdoor air is hot and opens the air supply passage 109, and bends when the outdoor air is cold and partially closes the air supply passage 109. In addition, moisture contained in the room air is frozen in the exhaust ventilation path 105 of the heat exchanger 110 and clogged, so that the exhaust air volume is not greatly reduced.
Japanese Utility Model Publication No. 2-103640

  In such a conventional air-conditioning exhaust fan, the supply air passage 109 is automatically closed by the damper 111 when the outside air temperature becomes low in winter, so the supply amount is reduced and the supply air to the heat exchanger 110 is reduced. By reducing the amount, clogging due to frost adhesion in the exhaust-side flow path of the heat exchanger 110 is attempted to be prevented.

  However, due to the amendment of the Building Standards Act for prevention of sick houses in 2003, mechanical ventilation is required for 24 hours in living rooms such as houses and offices, and appropriate air supply and exhaust volume corresponding to each room is required. Therefore, it is required to obtain a balanced supply / exhaust amount by eliminating a decrease in the supply / exhaust amount.

  The present invention solves such a conventional problem, and provides an efficient heat exchange type ventilator that prevents clogging due to condensation of the heat exchanger and has a balanced supply and exhaust amount. It is aimed.

  In order to achieve the above object, the heat exchange ventilator of the present invention is provided with heat provided at the intersection of the exhaust passage formed through the exhaust side blower and the supply passage formed through the supply side blower. An exchanger, and a water collecting means capable of condensing and collecting moisture contained in the exhaust flow by contacting and exchanging heat between the air flow in the exhaust flow path and the air supply flow path. It is arranged on the upstream side of the exchanger.

  By this means, clogging due to condensation of the heat exchanger is prevented, and an efficient heat exchange ventilator with a balanced supply / exhaust amount can be obtained.

  Another means is that the moisture collecting means is formed by a sensible heat exchanger that reduces the absolute humidity of the room air.

  By this means, the possibility of condensation and frost is reduced.

  Another means is that the heat exchanger is formed of a total heat exchanger that also exchanges moisture.

  By this means, latent heat contained in the exhaust can be recovered, and efficient heat exchange can be performed.

  Another means is that the exhaust-side blower and the supply-side blower are arranged on the downstream side of the heat exchanger.

  By this means, the efficiency of the heat exchanger can be improved and noise in the room can be reduced.

  Another means is that the moisture collecting means is made of a material having high thermal conductivity.

  By this means, the water collection efficiency of the water collection means can be increased.

  Further, another means is provided with fins parallel to the exhaust air flow and the air supply air using aluminum or an alloy thereof as the water collecting means.

  By this means, moisture collection efficiency can be increased and pressure loss can also be reduced.

  Another means is that the moisture collecting means is formed of a plate of aluminum or an alloy thereof.

  By this means, the water collecting means can be made at low cost, and the water collecting efficiency can be increased.

  In addition, the other means is configured such that a main body provided with an exhaust side blower and an air supply side blower on the upper side and a heat exchanger and moisture collecting means on the lower side is attached to the wall surface of the building.

  By this means, the safety of the blower and the electrical component can be improved.

  In another means, a filter is detachably provided from the outside at an indoor air inlet provided on the side of the main body.

  By this means, a heat exchange type ventilator with high maintainability can be obtained.

  Another means is that the moisture collecting means is provided at the lower side of the main body.

  By this means, the safety of the blower and the electrical component is improved.

  Another means is that a dish-shaped drain pan that is slightly larger than the main body is provided on the lower surface of the main body.

  By this means, it is possible to prevent the floor of the building from being contaminated with drain water.

  In another means, a drain pan is provided so as to form a bottom surface of the main body, and a drain outlet is provided in the drain pan.

  By this means, it can be provided at a low cost by reducing the number of parts, and the floor surface is not contaminated by drain water.

  Another means is that a heat insulating material made of a foam molded product is provided inside the drain pan.

  By this means, it is possible to prevent the condensed water from overflowing from the drain pan.

  Another means is to form a groove for allowing drain water to flow on the outer surface of the heat insulating material made of a foam molded product provided inside the drain pan.

  By this means, it is possible to prevent overflow of condensed water from the drain pan.

  ADVANTAGE OF THE INVENTION According to this invention, clogging by the dew condensation of a heat exchanger can be prevented, and the heat exchange type | formula ventilation apparatus with the effective effect with the balance of the air supply / exhaust amount can be provided.

  In addition, noise in the room can be reduced.

  Moreover, the water collection efficiency of the water collection means can be increased.

  Moreover, the safety | security of an air blower and an electrical component can be improved.

  Moreover, it can prevent that the floor surface of a building is contaminated with drain water.

  According to a first aspect of the present invention, an indoor air inlet and an indoor air outlet are communicated with each other in the main body, an exhaust passage formed through an exhaust side blower, an outdoor air inlet and an outdoor air in the main body. Heat provided so as to exchange heat between the exhaust air flow and the air supply air flow at the intersection of the air supply flow passage formed between the outlets and the air supply side air blower and the exhaust air flow passage and the air supply flow passage A heat exchanger that can exchange heat by contacting the air flow in the exhaust flow path and the air supply flow path and condenses and collects moisture contained in the exhaust flow, and the water collection means, By being arranged on the upstream side of the heat exchanger, the moisture collecting means first heat-exchanges the indoor air and the outdoor air, and collects the moisture in the indoor air to be exhausted, thereby collecting the heat exchanger. Prevents clogging of heat exchangers by reducing the amount of frost attached to the exhaust flow path Can have the effect that with a stable heat exchange ventilator can be performed by the water collecting means can be improved heat exchange efficiency of the whole system.

  In the invention according to claim 2, the moisture collecting means is formed by a sensible heat exchanger that lowers the absolute humidity of the room air, and the absolute humidity of the room air is lowered. The absolute humidity is lowered and the temperature is raised, so that the possibility of condensation and frost is reduced.

  Further, the invention described in claim 3 is a heat exchanger formed by a total heat exchanger that also exchanges moisture, so that latent heat contained in the exhaust gas can be recovered, and efficient heat exchange is possible. It has the effect of becoming.

  In the invention according to claim 4, the exhaust side blower and the supply side blower are arranged on the downstream side of the heat exchanger, and the suction side of the blower has a negative pressure and a small dynamic pressure component. Dispersion of the internal air currents of the heat exchangers that are stacked in a large number with only the pressure component becomes uniform. In addition, the presence of the blower from the indoor air inlet via the heat exchanger has the effect of making it difficult for noise to propagate into the room and improving the heat exchange rate.

  The invention according to claim 5 is the one in which the moisture collecting means is formed of a material having a high thermal conductivity, and has an effect that the efficiency of collecting moisture is increased.

  Further, the invention according to claim 6 is provided with fins parallel to the exhaust air flow and the supply air flow using aluminum or an alloy thereof in the moisture collecting means, and by making the fins parallel to the air flow, The pressure loss at this portion is eliminated, and the moisture collection efficiency can be increased.

  In the invention according to claim 7, the moisture collecting means is formed of aluminum or a plate of an alloy thereof, the moisture collecting means can be made at low cost, and the moisture collecting efficiency is high. It has the effect of becoming.

  The invention according to claim 8 is configured such that a main body provided with an exhaust side blower and an air supply side blower on the upper side and a heat exchanger and moisture collecting means on the lower side is attached to the wall surface of the building. Yes, in the moisture collecting means and the heat exchanger, the heat exchange between the indoor air and the outdoor air causes condensation to occur depending on the conditions, and the condensation drops as water droplets. The air-side blower is disposed above the moisture collecting means and the heat exchanger, so that the condensed water does not drip on the electric motor and electrical components that drive the blower, and the safety can be improved. Have.

  Further, the invention according to claim 9 is provided with a filter detachably attached to the indoor air inlet provided on the side of the main body from the outside, and the filter is provided so that adhesion of dust in the room is easily noticeable, Since the user can attach and detach the filter from the outside of the main body, it has an effect that the maintainability can be improved.

  Further, the invention according to claim 10 is provided with a water collecting means at a lower portion on the side of the main body, and the condensed water generated by the water collecting means is easily dropped on the bottom of the main body. Since it is possible to prevent water droplets from coming into contact with each other, the safety of the blower and the electrical parts is improved.

  Further, the invention according to claim 11 is provided with a dish-shaped drain pan that is slightly larger than the main body on the lower surface of the main body, as well as condensed water generated in the main body, as well as condensed water generated on the outer surface of the main body, It can be led to the drain pan and has the effect of preventing the floor surface of the building from being soiled by the condensed water from the main body.

  In the invention of claim 12, a drain pan is provided so as to form the bottom surface of the main body, and a drain outlet is provided in the drain pan. Even if a large amount of dew condensation water is generated, drain drain is continuously discharged from the drain port. It can be carried out in an inexpensive manner, and the floor surface of the building is not soiled and the number of parts is reduced, so that it can be provided at low cost.

  Further, the invention according to claim 13 is the one in which a heat insulating material by a foamed molded product is provided inside the drain pan, and the condensed water dropped on the drain pan is received by the heat insulating material that is the foam forming product, so that it overflows from the drain pan. Can be prevented.

  The invention according to claim 14 is the one in which a heat insulating material by a foamed molded product is provided inside the drain pan, and a groove for flowing drain water is formed on the outer surface of the heat insulating material. The drain water is efficiently moved in the drain pan, and the drain water from the drain pan can be prevented from overflowing.

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

(Embodiment 1)
As shown in FIG. 1, the indoor air inlet 2 and the indoor air outlet 3 communicate with each other in the main body 1, and the exhaust flow path 5 and the outdoor air inlet 6 and the outdoor air outlet 7 communicate with each other through the exhaust side blower 4. A total heat exchanger formed by laminating a plurality of heat exchange plates that transmit moisture at the intersection of the exhaust flow path 5 and the supply air flow path 9 by forming the supply air flow path 9 via the supply air blower 8. The heat exchanger 10 formed by the above is provided so as to exchange heat between the exhaust flow and the supply air flow, and the air flow in the exhaust flow channel 5 and the supply air flow channel 9 comes into contact with each other to exchange heat, so that the moisture contained in the exhaust flow The moisture collecting means 11 that condenses and collects water is formed by a sensible heat exchanger that lowers the absolute humidity of indoor air with a material having high thermal conductivity, and the moisture collecting means 11 is upstream of the heat exchanger 10. The exhaust-side blower 4 and the supply-side blower 8 are provided on the downstream side of the heat exchanger 10.

  In the above configuration, when the heat exchange ventilator is operated, the exhaust-side fan 4 and the supply-side fan 8 are simultaneously driven, and the exhaust-side fan 4 sucks indoor air into the exhaust flow path 5 from the indoor air inlet 2. High-temperature indoor air containing moisture contacts one surface of the moisture collecting means 11, while low-temperature outdoor air is drawn into the supply air flow path 9 from the outdoor air inlet 6 by the supply-side blower 8, and moisture collection is performed. It contacts the other surface of the means 11 and is condensed on one surface of the exhaust passage 5 side by the heat exchange action by the moisture collecting means 11 and passes through the heat exchanger 10 in a state where moisture contained in the exhaust flow is reduced. After the heat and moisture are stored, the air is exhausted from the outdoor air outlet 7 through the exhaust-side blower 4, while it is in contact with the other surface of the moisture collecting means 11 and is heat-exchanged, resulting in a slightly high temperature. The outdoor air that has passed through the heat exchanger 10 And the air is exhausted from the indoor air outlet 3 through the air supply side blower 8, so that an exhaust flow in which moisture is reduced by the moisture collecting means 11 passes through the heat exchanger 10. Thus, the amount of frost adhering to the exhaust passage of the heat exchanger 10 can be reduced, the clogging of the heat exchanger 10 due to condensation can be prevented, stable heat exchange ventilation can be performed, and the entire apparatus can be obtained by the heat exchange action in the moisture collecting means 11. The heat exchange efficiency is improved.

  Table 1 shows changes in temperature and humidity when a sensible heat exchanger that reduces the absolute humidity of room air is used as the moisture collecting means 11.

  As shown in (Table 1), the indoor air A and the outdoor air B are changed to the point C by the moisture collecting means 11, and the outdoor air B is changed to the point D. Then, C and D are heat-exchanged, the temperature and humidity of C move to point E, and D moves to point F, and the possibility of condensation and frost generation decreases. Moreover, the moisture collection efficiency of the moisture collection means 11 is improved by forming the moisture collection means 11 with a material having high thermal conductivity.

  Moreover, the latent heat contained in exhaust_gas | exhaustion can be collect | recovered by forming the heat exchanger 10 with the total heat exchanger which replaces | exchanges a water | moisture content.

  Further, the exhaust-side blower 4 and the supply-side blower 8 are arranged on the downstream side of the heat exchanger 10, so that the suction side of the exhaust-side blower 4 and the supply-side blower 8 has a negative pressure and a dynamic pressure component. Since the internal air flow of the heat exchanger 10 formed by laminating and forming only a static pressure component is reduced, the exhaust air blower is present from the indoor air inlet through the heat exchanger 10. Noise is difficult to propagate indoors.

(Embodiment 2)
As shown in FIG. 2 and FIG. 3, the moisture collecting means 11A is made of aluminum or an alloy thereof, and the fins 12A and 12B parallel to the exhaust flow and the supply air flow are partitioned, and the exhaust passage 13 and the supply passage 14 are partitioned. It is provided on the plate 15 and formed by integral molding. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the above-described configuration, the exhaust flow having a high temperature and containing moisture contacts the wide area of one surface of the fin 12A and the partition plate 15 when passing through the exhaust passage 13, and the supply air flow is When passing through the passage 14, the fin 12B comes into contact with a wide area on the other surface of the partition plate 15, the degree of heat exchange in the moisture collecting means 11 A is increased, the moisture collecting efficiency is increased, and the exhaust flow and supply are increased. The pressure loss in the fins 12A and 12B provided in parallel with the air flow is small, and the pressure loss can be reduced.

(Embodiment 3)
As shown in FIG. 4, a plate-shaped partition plate 16 made of aluminum or an alloy thereof, and a plurality of fins 12 </ b> C each having a mounting portion 17 are provided so as to form an exhaust passage 13 </ b> A on one surface of the partition plate 16. The other surface of the partition plate 16 is provided with a plurality of fins 12D provided with mounting portions 17A so as to form an air supply passage 14A, thereby constituting the moisture collecting means 11B.

  In the above configuration, the moisture collecting means 11B is made of a partition plate 16 and fins 12C and fins 12D made of a plate material of aluminum or an alloy thereof, and the fins 12C and fins 12D are easily formed by pressing or pulling. Can be manufactured at low cost, and the moisture reduction efficiency is good.

(Embodiment 4)
As shown in FIG. 5, the indoor air outlet 3A, the outdoor air outlet 7A, and the outdoor air inlet 6A are provided on the upper side in a box shape, and the indoor air inlet 2A and the indoor are provided in the main body 1A provided with the indoor air inlet 2A on the side. Communicating between the air outlets 3A through the exhaust air blower 4A, communicating between the exhaust air flow path 6A and the outdoor air inlet 6A and the outdoor air outlet 7A, and forming an air supply flow path 9A via the air supply side air blower 8A; A heat exchanger 10A is provided at the intersection of the exhaust flow path 5A and the supply air flow path 9A so as to exchange heat between the exhaust flow and the supply air flow, and the air flow in the exhaust flow path 5A and the supply air flow path 9A comes into contact with each other. When the moisture collecting means 11C that condenses and collects moisture contained in the exhaust flow after heat exchange is attached to the wall of the building together with the heat exchanger 10A, the exhaust fan 4A and the air supply side Provided at the lower side of the main body at a position below the blower 8A To configure. The indoor air inlet 2A is provided with a filter (not shown) that is detachable from the outside.

  In the above configuration, when the heat exchange type ventilator is operated, the exhaust-side fan 4A and the supply-side fan 8A are simultaneously driven, so that the high-temperature indoor air containing moisture contacts one surface of the moisture collecting means 11C, and the low-temperature air Is in contact with the other surface of the moisture collecting means 11C, and is condensed on one surface of the moisture collecting means 11C on the side of the exhaust flow path 5A due to the heat exchange action of the moisture collecting means 11C, thereby reducing the moisture in the exhaust flow. Thus, a small amount of water is condensed in the heat exchanger 10A.

  And the water | moisture content collected by the water | moisture-content collection means 11C and heat exchanger 10A which were provided in the main body side lower part eventually becomes a water droplet, and is dripped at the bottom part of the main body 1A, and is discharged | emitted. As a result, water drops dripping from the moisture collecting means 11C and the heat exchanger 10A do not come into contact with the exhaust-side fan 4A, the supply-side fan 8A, and the electrical components provided on the upper side of the main body 1A, thereby improving safety. Will be.

  Further, since the filter is detachably provided in the indoor air inlet 2A on the side of the main body, dust adheres easily and maintenance is improved.

(Embodiment 5)
As shown in FIG. 6, it is set as the structure which provided the dish-shaped drain pan 18 which formed the opening a little larger than the main body 1B in the lower surface of the main body 1B.

  In the above configuration, both water droplets generated by the moisture collecting means and heat exchanger (not shown) provided in the main body 1B and water droplets generated on the outer surface of the main body 1B are guided to the drain pan 18 and collected. Thus, water drops from the main body 1B to the floor surface of the building and the floor surface are not soiled.

(Embodiment 6)
As shown in FIG. 7, a dish-shaped drain pan 18A having an opening slightly larger than the lower surface of the main body 1C is provided so as to form the bottom surface of the main body 1C, and the drain port 19 is provided in the drain pan 18A.

  In the above configuration, both the water droplets generated from the moisture collecting means and heat exchanger (not shown) provided in the main body 1C and the water droplets generated on the outer surface of the main body 1C are guided to the drain pan 18A and collected. The condensed water collected by 18A will be discharged | emitted continuously from the drain outlet 19. FIG.

  The drain pan 18A is also used as the member that forms the bottom surface of the main body 1C, so that the number of components is reduced. Even if a large amount of condensed water is generated on the main body 1C side by providing the drain port 19, the drain pan Condensed water can be drained continuously at the drain port 19 by being received at 18A and can be provided at a low cost, and even if a large amount of condensed water is generated, the floor of the building is not soiled.

(Embodiment 7)
As shown in FIG. 8, a heat insulating material 20 made of a foam molded product is provided inside the drain pan 18 </ b> B, and a groove 21 for flowing drain water is provided on the outer surface of the heat insulating material 20.

  In the above configuration, when the member constituting the main body 1C is also used as the drain pan 18B, the surface of the main body 1C is in contact with the heat insulating material 20 and the drain pan 18B so as to insulate the drain pan 18B and the air flow path in the main body 1C. By providing the groove 21 for flowing the generated condensed water in the heat insulating material 20 of the foam molded product, when the condensed water generated in the main body 1C becomes a water droplet and drops on the drain pan 18B, the heat insulating material 20 by the foam molded product It is received and flows through the groove 21 provided on the outer surface of the heat insulating material 20 and flows on the bottom surface of the drain pan 18B. It is possible to prevent the dew condensation water from being efficiently moved within 18B, draining from the drain port 19A, and overflowing the dew condensation water from the drain pan 18B. It may be thermally insulated with respect to the body 1C.

  Using the drain pan configuration, it can also be applied to the use of draining condensed water from air conditioners.

Sectional drawing of the heat exchange type ventilation apparatus of Embodiment 1 of this invention Sectional drawing of the heat exchange type ventilation apparatus of Embodiment 2 of this invention Perspective view of moisture collecting means of the heat exchange type ventilator The perspective view of the moisture collection means of the heat exchange type ventilator of Embodiment 3 of this invention Sectional drawing of the heat exchange type ventilator of Embodiment 4 of this invention The perspective view of the heat exchange type ventilator of Embodiment 5 of this invention The fragmentary perspective view of the heat exchange type | formula ventilation apparatus of Embodiment 6 of this invention. The exploded perspective view of the drain pan of the heat exchange type ventilator of Embodiment 7 of this invention Sectional view of the damper extended state of a conventional air-conditioning ventilation fan Sectional view of damper refraction state of the air conditioning ventilation fan

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 1A Main body 1B Main body 1C Main body 2 Indoor air inlet 3 Indoor air outlet 4 Exhaust air blower 4A Exhaust air blower 5 Exhaust flow path 6 Outdoor air inlet 7 Outdoor air outlet 8 Supply air blower 8A Supply air blower 9 Supply air flow path DESCRIPTION OF SYMBOLS 10 Heat exchanger 10A Heat exchanger 11 Moisture collecting means 11A Moisture collecting means 11B Moisture collecting means 11C Moisture collecting means 12A Fin 12B Fin 18 Drain pan 18A Drain pan 18B Drain pan 19 Drain outlet 20 Heat insulating material 21 Groove

Claims (14)

An exhaust passage formed between the indoor air inlet and the indoor air outlet in the main body through an exhaust fan, and an outdoor air inlet and the outdoor air outlet in the main body are connected through an air supply fan. A formed air supply passage, a heat exchanger provided to perform heat exchange between the exhaust flow and the supply air flow at the intersection of the exhaust flow passage and the supply flow passage, and the exhaust flow passage and the supply flow passage. The heat exchange is provided with water collecting means capable of condensing and collecting moisture contained in the exhaust stream by contact with the airflow and heat exchange, and the moisture collecting means is disposed on the upstream side of the heat exchanger. Shape ventilation device. The heat exchanging ventilator according to claim 1, wherein the moisture collecting means is formed of a sensible heat exchanger that reduces the absolute humidity of the room air. The heat exchange type ventilator according to claim 1 or 2, wherein the heat exchanger is formed of a total heat exchanger that also exchanges moisture. The heat exchange type ventilator according to claim 1, 2 or 3, wherein the exhaust side blower and the supply side blower are arranged on the downstream side of the heat exchanger. 5. The heat exchange type ventilator according to claim 1, wherein the moisture collecting means is made of a material having high thermal conductivity. 5. The heat exchange type ventilator according to claim 1, wherein the moisture collecting means is made of aluminum or an alloy thereof and includes fins parallel to the exhaust flow and the supply air flow. 7. The heat exchange type ventilator according to claim 6, wherein the moisture collecting means is formed of a plate material made of aluminum or an alloy thereof. The heat according to claim 1, 2, 3 or 4, wherein the exhaust side blower and the supply side blower are arranged on the upper side, and the main body provided with the heat exchanger and the moisture collecting means on the lower side is attached to the wall surface of the building. Exchangeable ventilator. The heat exchange type ventilator according to claim 8, wherein a filter is provided in a room air inlet provided on a side of the main body so as to be detachable from the outside. The heat exchange type ventilator according to claim 8, wherein the moisture collecting means is provided at a lower side portion of the main body. The heat exchange type ventilator according to claim 8, wherein a dish-shaped drain pan slightly larger than the main body is provided on the lower surface of the main body. The heat exchange ventilator according to claim 9, wherein a drain pan is provided so as to form a bottom surface of the main body, and a drain outlet is provided in the drain pan. The heat exchange type ventilator according to claim 11 or 12, wherein a heat insulating material made of a foam molded product is provided inside the drain pan. The heat exchange type ventilator according to claim 13, wherein a groove for allowing drain water to flow is formed on the outer surface.

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