JPH08327104A - Window ventilator - Google Patents

Abstract

PURPOSE: To prevent deterioration of the fixing strength of a window ventilator body, generation of the rattling noise, generation of a space between a flange part of the window ventilator body and a plate, and entering of rain from the space. CONSTITUTION: A fixing spring 9 consisting of an approximately V-shaped spring where a tip part is opposite to the end part on the outdoor 4 side of a flange part 7 with the space smaller than the thickness of an elastic frame 5, and a center part 10 is swollen outwardly from an outer circumferential part of a body 6 in the free condition is formed of the shape to be abutted on the elastic frame 5 so that the tip side part moves the body 6 to the outdoor 4 side and to the center of an opening hole 2. Deterioration of the fixing strength of the body 6, generation of the rattling noise, generation of the space between the flange part 7 of the body 6 and a plate 1, and entering of rain from the space into the indoor 3 side can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation fan for a window, which is mainly attached to a window of a living room or an office and ventilates the air in the room.

[0002]

2. Description of the Related Art In recent years, with the rise of buildings, the ventilation fans for windows mounted on plate materials such as window glass provided above these buildings can be easily installed from the indoor side. Thus, a structure having good workability has been desired.

For this reason, the conventional window ventilation fan of this type generally has a structure as shown in FIGS. That is, a circular opening 102 provided in a plate material 101 such as a window glass is made of vinyl chloride or vinyl acetate so as to cover the inner peripheral edge and the side surface of the indoor 104 and the outdoor side 107 around the inner peripheral edge. A cylindrical main body 105 inserted from the room 104 side into an elastic frame 103 formed in a ring shape by fitting a packing member 103A made of a soft resin material into a plate material 101 at the end of the room 104 side. The elastic frame 10 is provided between the flange portion 106 provided along the direction and the upper support piece 108 and the lower support piece 109 projecting vertically from the outer peripheral portion of the outdoor 107 side end portion.
It was fixed to the plate member 101 with the plate member 101 sandwiched therebetween.

At the outdoor end of the main body 105, there is provided a shutter portion 111 for opening and closing the opening of the main body 105 on the outdoor 107 side in conjunction with the pulling operation of the operation string 110 led out to the indoor side. ing. Also, the main body 10
A blower 114 composed of an electric motor 113 having rotary vanes 112 on the side of the room 104 is provided inside the chamber 5.
The blower 114 is connected to a switch (not shown) that is turned ON / OFF in conjunction with the operation of the operation cord 110, and is configured to operate when the shutter portion 111 is opened and stop when the shutter portion 111 is closed. There is. The blower 114 is provided at the end of the main body 105 on the indoor 104 side.
The rotary blade 112 is detachably provided with an orifice 115 for efficiently guiding the air on the side of the room 104.

In order to mount the window ventilation fan constructed as described above on the plate member 101, first, as shown in FIG.
An opening 102 is opened in the plate member 101 from the 04 side, and an annular elastic frame 103 is formed by fitting the packing member 103A along the inner peripheral portion of the opening 102, and then, as shown in FIG. The orifice 115 is removed from the body 105 and the flange portion 106 is removed as shown in FIG.
After loosening the rotary screw 116 screwed into the female screw hole (not shown) provided in the upper portion of the elastic frame 1 between the upper support piece 108 of the main body 105 and the flange portion 106,
Plate member 1 on the upper side of the peripheral portion of the opening hole 102 with 03 interposed.
While pressing the main body 105 upward so as to sandwich 01, the lower support piece 109 is pushed out to the outside 107 side, and the elastic frame 103 is interposed between the lower support piece 109 and the flange portion 106 to open the opening hole 102. After pushing down the main body 105 so as to sandwich the plate material 101 on the lower side of the peripheral edge portion, tighten the rotary screw 116 so that the main body 105 does not move upward and come off the plate material 101, and then attach the orifice 115 to the main body 105. Therefore, the construction work is completed from the room 104 side.

[0006]

By the way, a window ventilation fan provided directly on a plate material 101 such as a window glass is easily affected by ultraviolet rays and heat from the sun. However, in the above conventional ventilation fan for windows, the flange portion 106 of the main body 105 is
The elastic frame 103 made of a vinyl-based soft resin material is interposed between the upper support piece 108 and the lower support piece 109, and the main body is fixed to the opening 102 by the elastic force of the elastic frame 103. Therefore, when the elastic frame 103 deteriorates due to the ultraviolet rays and heat of the sun and its elastic force decreases, the fixing strength of the main body 105 decreases and the rattling noise caused by the influence of the outside wind or the like occurs. Occurrence, or the flange 1
There is a problem that a gap is generated between the plate 06 and the plate material 101, and rainwater enters the room 104 side from the gap to damage the building or give discomfort to the occupants.

The present invention solves the above-mentioned problems. The fixing strength of the main body is lowered, rattling noise is generated, and a gap is generated between the flange portion of the main body and the plate material. It is a first object of the present invention to provide a ventilation fan for windows capable of preventing the intrusion of the air into the indoor side without impairing the construction workability.

The second object is to improve the fixing strength of the main body. A third object is to achieve the above second object more reliably without increasing the number of parts.

[0009]

In order to achieve the above first object, the window fan of the present invention has a first means which is an inner peripheral edge portion of an opening hole provided in a plate material such as a window glass and the like. An elastic frame formed in a frame shape by being fitted to cover the indoor side surface and the outdoor side surface around the peripheral edge portion, and a tubular shape that is inserted into the elastic frame from the indoor side. The main body having a flange portion having an outer dimension larger than that of the opening hole, a shutter portion that opens and closes the outdoor opening of the main body, a blower provided inside the main body, and an indoor side of the main body. An orifice which is detachably provided and which guides air to the blower, and a base end side of which is fixed to the outdoor side of the main body, a front end portion of which is in a free state, and a central portion of which extends outward from the outer peripheral portion of the main body. With a fixed spring made of V-shaped spring material, The fixing spring, a structure in which tip side is formed in contact with the shape on the elastic frame so as to move the body toward the center of the outdoor side and the opening hole.

In order to achieve the second object, the second means is a gap formed between the inner peripheral portion of the elastic frame and the outer peripheral portion of the main body when the main body is mounted on the elastic frame. A female screw hole communicating with the main body is provided in the flange portion of the main body, and the female screw hole is screwed into the female body from the indoor side. The ventilation fan for windows is provided with a fixing screw that supports the fan so that it can be pushed outward.

In order to achieve the second object, the third means is a gap formed between the inner peripheral portion of the elastic frame and the outer peripheral portion of the main body when the main body is mounted on the elastic frame. A through hole communicating with the main body is provided in the flange portion of the main body, and the through hole is closed from the indoor side, and a support piece for supporting the tip end portion of the fixed spring through the gap so as to spread outwardly of the main body. The ventilation fan for windows will be provided.

In order to achieve the third object, the fourth means is a window ventilation fan in which the supporting piece of the third means is integrally formed with the orifice.

[0013]

According to the present invention, by the constitution of the above-mentioned first means, when the main body is inserted into the elastic frame from the indoor side, the fixed spring becomes
It contacts the inner circumference of the elastic frame, the central part is pushed and bent in the direction of the main body, and passes through the elastic frame according to the movement of the main body, and when the central part reaches the outdoor side, the central part is the anti-main body. Spread in the direction. Then, the tip portion comes into contact with the elastic frame and acts so as to move the main body to the outside of the room and toward the center of the opening hole, so that the main body is provided between the flange portion 7 and the tip portion of the fixed spring. The plate member is fixed to the opening hole portion of the plate member by sandwiching the plate member.

According to the structure of the second means, after mounting the main body in the opening, the tip end of the fixing screw is supported so as to push the tip end of the fixing spring outward of the main body. The urging force is increased and the fixing strength of the main body is improved.

According to the structure of the third means, after the main body is mounted in the opening hole, the tip end of the fixed spring is supported by the supporting piece so as to be expanded outward of the main body, whereby the urging force of the fixed spring is increased. As a result, the fixing strength of the main body is improved.

Further, according to the constitution of the fourth means, it is not necessary to separately prepare and attach the supporting piece, so that the number of parts can be reduced, and moreover, forgetting to attach the supporting piece can be surely prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.

As shown in the drawing, a circular opening 2 is provided in a plate material 1 such as a window glass so as to cover the inner peripheral edge portion and the side surfaces of the interior 3 and the exterior 4 around the inner peripheral edge portion. A ring-shaped elastic frame 5 is formed by fitting a band-shaped packing member made of a soft resin material such as vinyl chloride or vinyl acetate and having a substantially U-shaped cross section. The cylindrical main body 6 is inserted and mounted. The main body 6 has a flange portion 7 extending to the end portion on the side of the room 3 and having an outer diameter larger than the diameter of the opening hole 2, and a lower support piece 8 protruding downward from the lower end portion of the outer peripheral portion. . The lower support piece 8 has a vertical surface facing the flange portion 7 at a position separated from the flange portion 7 by a distance A which is slightly smaller than the thickness of the elastic frame 5 (lateral width when viewed from the side), and from this vertical surface to the outdoor 4 side. It is formed of a guide slope 12 whose height decreases as it goes.

Further, a base end portion is provided on the outer peripheral portion of the main body 6.
Is fixed to the end portion of the outdoor side of the outer side of the elastic member 5 and is separated from the flange portion 7 by a distance B which is slightly smaller than the thickness of the elastic frame 5 in a free state.
There is provided a fixed spring 9 formed of a substantially V-shaped spring material whose central portion 10 bulges outward from the inner diameter of the elastic frame 5. On the tip end side of the fixed spring 9, there is formed an inclined portion 11 that is bent so as to face the main body 6 side midway from the central portion 10.

The main body 6 is fixed by the flange portion 7 and the lower support piece 8, and the flange portion 7 and the inclined portion 11 of the fixed spring 9 with the elastic frame 5 interposed therebetween to sandwich the plate material 1. There is.

On the other hand, inside the main body 6, an electric motor 14 fixed to a fixed leg 13 protruding from the inner peripheral wall of the main body 6.
A blower 17 having blades 16 fixed to a rotary shaft 15 of the blower 1 is provided, and the blower 1 is provided on the side of the interior 3 of the flange portion 7 of the main body 6.
An orifice 18 for guiding air and a makeup grill 19 covering the front of the orifice 18 are detachably fitted to the blades 16 of No. 7. Further, a plurality of shutter plates 20 that open and close the outdoor side openings and a connecting plate 2 that connects the shutter plates 20 are provided in the outdoor 4 side opening of the main body 6.
There is provided a shutter unit 23 including a shutter opening / closing device 22 that drives the shutter plate 20 via the shutter 1. Then, the shutter opening / closing device 2 of the shutter unit 23
2 is connected to the electric motor 14 of the blower 17, and is configured to open the shutter plate 20 when the blower 17 is operating and close the shutter plate 20 when the blower 17 is stopped.

The installation work of the window ventilation fan constructed as described above will be described below. First, the opening hole 2 is opened from the side of the room 3 in the plate material 1, and the ring-shaped elastic frame 5 is formed by fitting the packing member along the inner peripheral portion of the opening hole 2 in advance. When the main body 6 is inserted into the elastic frame 5 from the indoor side 3, it moves to the outdoor side while being pushed up along the guide inclined portion 12 of the lower support piece 8, and at the same time, the fixed spring 9 is elastic. The central portion 10 is pressed against the inner peripheral portion of the frame 5 and is bent in the direction of the main body 6 so as to pass through the inside of the elastic frame 5 as the main body 6 moves.
When 0 reaches the outdoor side 4, the central portion 10 expands in the direction opposite to the main body 6. Then, since the tip portion is formed so as to have a distance B closer to the thickness of the flange portion 7 from the flange portion 7 in the free state, the inclined portion 11 on the tip end side abuts on the inner peripheral portion of the elastic frame 5. Acting to move the main body 6 downward to the outdoor 4 side. Then, similarly, the lower support piece 8 which passes through the inside of the elastic frame 5 and whose vertical surface reaches the outdoor side 4 side
Is pushed down by the self-weight of the main body 6 and the biasing force of the fixed spring 9 so as to sandwich the lower portion of the elastic frame 5 with the flange portion 7. At this time, the distance A between the flange portion 7 and the vertical surface of the lower support piece 8 is Is formed to be smaller than the thickness of the elastic frame 5, the main body 6 is firmly held by the elastic frame 5 and fixed in a stable state. In this way, the main body 6 sandwiches the plate member 1 by interposing the elastic frame 5 between the flange part 7, the inclined part 11 on the tip end side of the fixed spring 9 and the lower support piece 8 so that the plate member 1 is sandwiched. It will be fixed to the opening hole 2 part.

On the other hand, the work of removing the window ventilation fan installed as described above from the opening 2 will be described below.

First, contrary to the above-mentioned installation work, the end of the main body 6 fixed to the opening 2 on the side of the room 3 is lifted upward to disengage from the engagement with the lower support piece 8, and in this state. When 6 is pulled toward the room 3 side, the fixed spring 9 pushes the central portion 10 toward the main body 6 while the inclined portion 11 on the tip end side is pressed against the inner peripheral portion of the elastic frame 5 in accordance with the movement of the main body 6. The main body 6 can be removed from the opening 2 of the plate 1 while passing through the inside of the elastic frame 5 so as to be bent.

As described above, according to the window ventilation fan of the first embodiment of the present invention, elasticity is provided between the flange portion 7 of the main body 6, the inclined portion 11 on the tip end side of the fixed spring 9 and the lower support piece 8. In addition to sandwiching the plate material 1 by the elastic force of the elastic frame 5 with the frame 5 interposed, the fixing spring 9 moves the main body 6 to the outside 4 side and downward, and the opening hole 2 of the plate material 1 is formed. Since the elastic frame 5 is deteriorated by receiving the ultraviolet rays and heat of the sun and its elastic force is reduced, the fixing strength of the main body 6 is reduced and rattling noise is generated. A gap is generated between the flange portion 7 of the main body 6 and the plate material 1, and it is possible to prevent rainwater from entering the room 3 side through this gap, and moreover, the installation work in such a state can be performed in the room 3 Can be completed from the side.

In the first embodiment, the fixed spring 9 and the lower support piece 8 are used together, and these and the flange portion 7 of the main body 6 are used.
The case where the main body 6 is fixed to the opening hole 2 portion of the plate material 1 by sandwiching the plate material 1 with the elastic frame 5 interposed therebetween has been described, but the present invention is not limited to this and, for example, a lower support. If the second fixed spring is provided instead of the piece 8, the biasing force of the fixed spring is evenly applied to the main body 6 from the vertical direction, and the fixed state of the main body 6 becomes more stable. At the time of withdrawing the main body 6, even if the end of the main body 6 on the indoor side 3 side is not lifted up, simply pulling the main body 6 toward the indoor side 3 with a force stronger than the biasing force of the fixed spring,
It can be easily removed.

Further, a circular opening hole 2 opened in the plate material 1
The case where the cylindrical main body 6 is fixed to the portion by using the fixing spring 9 has been described, but the present invention is not limited to this. For example, a square opening hole is opened in the plate material 1, and a square is formed in the opening hole portion. The tubular body may be fixed using the fixed spring 9,
It does not make a difference in its action and effect.

Next, a second embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in the figure, the second embodiment is the same as the first embodiment.
In contrast to the embodiment, when the main body 6A is attached to the elastic frame 5,
A female screw hole 26 communicating with the gap 25 formed between the inner peripheral portion of the elastic frame 5 and the outer peripheral portion of the main body 6A is provided in the flange portion 7A of the main body 6A, and is screwed into the female screw hole 26 from the room 3 side. This is characterized in that the tip portion of the fixing spring 9 contacts the tip portion of the fixed spring 9 through the gap 25, and the fixing screw 27 is provided to support the tip portion so as to push the tip portion outward of the main body 6A.

In the above structure, when the main body 6A is inserted into the elastic frame 5, the orifice 18 and the decorative grill 19 are removed from the flange portion 7A, and the fixing screw 27 is used.
The main body 6A is fixed to the opening 2 of the plate 1 in the same manner as in the first embodiment with the fixing screw 27 loosened so that the front end of the main body is located near the outdoor 4 side end of the flange 7A. Further, the tip of the fixed spring 9 passes through the gap 25.
After tightening the fixing screw 27 so as to push and spread the tip end of the main body 6A to the outside of the main body 6A, by mounting the orifice 18 and the makeup grill 19 on the flange portion 7A of the main body 6A, the installation work is performed from the indoor side 3 side. Can be completed.

Further, when removing the main body 6A from the opening 2 of the plate member 1, the main body 6A can be easily removed by the reverse procedure of the above-mentioned installation work.

As described above, according to the window ventilation fan of the second embodiment of the present invention, after the main body 6A is mounted in the opening hole 2 portion of the plate member 1,
Use the tip of the fixing screw 27 to attach the tip of the fixed spring 9 to the main body 6A.
By supporting so as to spread outwardly, the urging force of the fixing spring 9 is strengthened and the fixing strength of the main body 6A can be improved.

Next, a third embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in the figure, the third embodiment is similar to the first embodiment described above.
In contrast to the embodiment, a through hole 28 that communicates with a gap 25 formed between the inner peripheral portion of the elastic frame 5 and the outer peripheral portion of the main body 6B when the main body 6B is mounted on the elastic frame 5 has a flange portion of the main body 6B. 7B, the through hole 28 is closed from the room 3 side, and the tip end portion of the fixed spring 9 is passed through the gap 25.
It is characterized in that a support piece 29 for supporting the B part so as to be pushed outward is attached to a screw boss portion 30 provided on the inner side of the flange portion 7B by a detachable screw 31 so as to be detachable.

In the above structure, when inserting the main body 6B into the elastic frame 5, the orifice 18 and the decorative grill 19 are removed from the flange portion 7B, and the attaching / detaching screw 31 is attached.
Is loosened and the support piece 29 is removed from the flange portion 7B, the main body 6B is fixed to the opening hole 2 portion of the plate material 1 in the same manner as in the first embodiment, and the support piece 29 passes through the gap 25 to fix the spring. 9 is fixed to the flange portion 7B with the attaching / detaching screw 31 so as to push the tip end portion 9 of the main body 6B outwardly and to close the through hole 28 by the support piece 29, and then the orifice 18 is attached to the flange portion 7B of the main body 6B. By installing the makeup grill 19 and the makeup grill 19, the installation work can be completed from the room 3 side.

Further, when the main body 6B is removed from the opening 2 of the plate member 1, it can be easily removed from the opening 2 by the reverse procedure of the above-mentioned installation work.

As described above, according to the window ventilation fan of the third embodiment of the present invention, after the main body 6B is attached to the opening 2 portion, the support piece 2 is
By supporting the tip end of the fixed spring 9 so as to spread outwardly of the main body 6B with 9, the urging force of the fixed spring 9 is strengthened and the fixing strength of the main body 6B can be improved.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. The same components as those in the third embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the fourth embodiment is similar to the third embodiment described above.
It is characterized in that the supporting piece 29A is integrally formed at the end of the orifice 18A on the outdoor 4 side as compared with the embodiment.

In the above structure, when the main body 6C is inserted into the elastic frame 5, the flange portion 7C to the orifice 18A,
The decorative grille 19 is removed, and the main body 6C is fixed to the opening 2 of the plate 1 in the same manner as in the first embodiment. Further, the support piece 29A passes through the gap 25 and the tip of the fixed spring 9 is fixed to the main body 6C. The orifice 18A so that it can be expanded outwardly and the through hole 28 can be closed.
The mounting work can be completed from the room 3 side by mounting the makeup grill 19 after mounting on the flange portion 7C of C.

As described above, according to the window ventilation fan of the fourth embodiment of the present invention, since it is not necessary to separately prepare the support piece 29A and attach it to the main body 6C, the number of parts is reduced, and the support piece 29A is It will be possible to reliably prevent forgetting to attach.

[0042]

As is apparent from the above embodiments, according to the present invention, the inner peripheral edge portion of the opening hole provided in the plate material such as the window glass and the indoor side surface and the outdoor side surface around the inner peripheral edge portion are formed. An elastic frame which is fitted to cover and is formed in a frame shape, and a tubular shape which is inserted into the elastic frame from the indoor side, and has an outer dimension larger than the dimension of the opening hole outward at the indoor opening end portion. A main body having a flange portion, a shutter portion that opens and closes an outdoor opening of the main body, a blower provided inside the main body, and a detachably provided indoor side of the main body to guide air to the blower. And its proximal end side is fixed to the outdoor side of the main body, the front end portion faces the outdoor side end portion of the flange portion at an interval smaller than the thickness of the elastic frame, and the central portion in a free state. Bulges outward from the outer periphery of the body A fixed spring formed of a V-shaped spring material, and the fixed spring is formed in a shape in which the tip end side abuts the elastic frame so as to move the main body to the outside of the room and toward the center of the opening hole. As a result, the fixing strength of the main unit will decrease, rattling noise will be generated, and a gap will be created between the flange part of the main body and the plate material, and rainwater will enter the indoor side through this gap. It is possible to provide a ventilation fan for windows that can be prevented without impairing the property.

Further, when the body is mounted on the elastic frame, the tip of the fixing screw is supported so as to push the tip of the fixed spring outwardly of the body, thereby improving the fixing strength of the body. it can.

Further, when the main body is mounted on the elastic frame, the fixing strength of the main body can be improved by supporting the tip end of the fixed spring by the support piece so as to push it outwardly of the main body.

Further, by integrally forming the support piece with the orifice, the fixing strength of the main body can be surely achieved without increasing the number of parts.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an installed state of a window ventilation fan according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a state in which a tip end portion of a fixed spring of a window ventilation fan of the second embodiment is supported by a fixing screw.

FIG. 3 is a cross-sectional view showing a state in which a tip of a fixed spring of a window ventilation fan of the third embodiment is supported by a support piece.

FIG. 4 is a cross-sectional view showing a state in which a tip end portion of a fixed spring of a window ventilation fan of the fourth embodiment is supported by a support piece.

FIG. 5 is a cross-sectional view showing an installation state of a conventional window ventilation fan.

FIG. 6 is a cross-sectional view showing the installation situation of the ventilation fan for the same window.

FIG. 7 is a perspective view showing a formation state of an elastic frame of the ventilation fan for the window.

[Explanation of symbols]

 1 Plate Material 2 Opening Hole 3 Indoor 4 Outdoor 5 Elastic Frame 6 Main Body 6A Main Body 6B Main Body 6C Main Body 7 Flange 7A Flange 7B Flange 7C Flange 9 Fixing Spring 10 Center 17 Blower 18 Orifice 18A Orifice 25 Shutter 26 Female screw hole 27 Fixing screw 28 Through hole 29 Support piece 29A Support piece

Claims (4)

[Claims] 1. An elastic frame formed in a frame shape by being fitted so as to cover an inner peripheral edge portion of an opening provided in a plate material such as a window glass and an indoor side surface and an outdoor side surface around the inner peripheral edge portion. And a main body that is a cylindrical shape that is inserted into the elastic frame from the indoor side, and that has a flange portion having an outer dimension larger than the dimension of the opening hole outwardly at the indoor side opening end, and the outdoor side opening portion of the main body. A shutter part for opening and closing the fan, a blower provided inside the main body, an orifice that is detachably provided on the indoor side of the main body, and guides air to the blower, and a base end side thereof is outside the main body. A fixed spring formed of a substantially V-shaped spring member that is fixed and has a free end portion and a central portion that bulges outward from the outer peripheral portion of the main body. So that it moves outward and toward the center of the opening A ventilation fan for windows formed in a shape that abuts against the elastic frame. 2. A female screw hole communicating with a gap formed between an inner peripheral portion of the elastic frame and an outer peripheral portion of the main body when the main body is attached to the elastic frame is provided in a flange portion of the main body.
A fixing screw is provided which is screwed into the female screw hole from the inside of the chamber, the tip of which abuts against the tip of the fixed spring through the gap, and which supports the tip so as to push the tip outward of the main body. The ventilation fan for windows according to claim 1. 3. A flange portion of the main body is provided with a through hole that communicates with a gap formed between the inner peripheral portion of the elastic frame and the outer peripheral portion of the main body when the main body is mounted on the elastic frame. 2. The ventilation fan for windows according to claim 1, further comprising a support piece that closes the through hole from the inside of the room and supports the tip end of the fixed spring so as to push the tip end of the fixed spring outward through the gap. 4. The ventilation fan for windows according to claim 1, wherein the support piece is integrally formed with the orifice.