JP2013044088A - Ventilation member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation member having excellent water-proofness and fire-proofness, which can be easily arranged and readily installed, capable of being easily manufactured.SOLUTION: A ventilation member A comprises: a case-shaped member 10 including a roof board contact part 11 which comes in contact with the top face of a roof board 1 at the edge of the eaves, an exterior material contact part 12 which is arranged in approximately parallel with the roof board contact part 11 and comes in contact with the upper end of an exterior member 2, an external-side vent hole 13a having an external opening, and an attic vent hole 14 having an opening on the side of an attic 5; and an opening and closing member 20 including an on-off valve 21 which is arranged in the case-shaped member 10 and actuated by the wind so as to close a ventiduct 4 from the external-side vent hole 13a to the attic vent hole 14, an accommodation part 22 for accommodating an incombustible volume expansion member 31 which expands by heat, and a fitted part 23 to be fitted to a fitting part 16 of the case-shaped member 10. The opening and closing member 20 is fixed to the case-shaped member 10 by fitting the fitting part 16 to the fitted part 23, and inserted between the roof board contact part 11 and the case-shaped member 10 so as to be fixed to the roof board 1.

Description

  The present invention relates to a ventilation member that is configured at the eaves to ventilate the back of a hut.

  It is common to install ventilation members on the eaves of a building to ventilate the outside and the back of the hut. However, if the eaves cannot be constructed, or if the nose cover is not used to simplify the fitment, and the exterior material is set up directly to Hirokomai, or avoid the eaves that are visible, the shed In the case of ventilation on the back side, a ventilation structure in which a ventilation member is installed in the vicinity of the eaves's Hirokomai may be configured.

  Several techniques have been proposed for realizing such a ventilation structure (see, for example, Patent Documents 1 to 3). These techniques have their respective characteristics and are useful when applied for each of the above-described conditions.

  In the technique described in Patent Document 1, a reverse hat type Hiroko Mai having a bottom surface provided with ventilation holes on both sides is attached to the tip portion of the field plate, thereby ventilating the outdoor side and the indoor side of the nose cover plate, respectively. An air passage is configured by arranging holes.

  The technique described in Patent Document 2 is to directly start up the exterior material up to Hirokomai, and form a waterproof air passage for draining water that continues from the exterior material to the edge of the eaves to the sloped roof, One vent hole of the vent path is opened downward to the outside of the exterior material, and the other vent hole is opened to the back of the hut.

  In the technique described in Patent Document 3, a ventilator main body having an intake opening is attached to the eaves, and an air passage extending from the intake opening to the attic space is formed inside the ventilator main body. The closing member is arranged to be slidable in a part of the air passage. And it is comprised so that a ventilation path can be obstruct | occluded when a closure member perturbs and contacts the projection part (water return part) provided in the ventilation apparatus main body.

JP 2001-349023 A (Patent No. 4363608) JP 2008-150904 A JP 2008-304140 A

  However, even each of the above technologies is not yet complete. For example, in the technology described in Patent Document 1, anxiety about blowing rainwater and a field plate at the eaves portion are omitted. Fixing may become unstable.

  Moreover, in the technique described in Patent Document 2, it is necessary to separately prepare a dedicated base material for installing the ventilation member, and the accommodation becomes complicated, so the installation work of the ventilation member is complicated.

  Moreover, in the technique described in Patent Document 3, since the ventilation device is installed in parallel to the wall surface, it is difficult to cope with a roof having various slopes with one kind of member. It is necessary to prepare a member.

  An object of the present invention is to provide a ventilation member that is excellent in waterproofing and fireproofing, can be easily installed, can be easily installed, and can be easily manufactured.

  In order to solve the above problems, a ventilation member according to the present invention is provided with a base plate contact portion that contacts the upper surface of the base plate of the eaves, and is arranged substantially parallel to the base plate contact portion, and the upper end portion of the exterior member is A case-like member having an exterior material abutting portion to be in contact with, an outside-side vent opening to the outside, and a shed-side vent opening to the back of the shed, and arranged inside the case-like member and operated by wind An on-off valve that closes a ventilation path from the external side vent to the cabin back vent, a housing part that is disposed inside the case-like member and can accommodate a noncombustible volume expansion member that expands by heat, and the case An opening / closing member provided with a fitting portion that can be fitted with a fitting portion that is formed on the shaped member, and the opening / closing member fits the fitting portion and the fitting portion. By attaching to the case-like member, the field plate and the field plate contact portion In the serial case-like member it is intended to be attached by clamping incoming.

  In the ventilation member, it is preferable that a noncombustible volume expansion member is provided in the housing portion.

  Further, another ventilation member according to the present invention includes a field plate contact portion that contacts the upper surface of the field plate at the eaves, and a field plate edge that is connected to the field plate contact portion and contacts the small surface of the field plate. A surface abutting portion, an exterior material abutting portion that is arranged substantially in parallel with the field plate abutting portion and abuts the upper end of the exterior material, an external vent opening that opens to the outside, and an attic ventilation that opens to the back of the shed A case-like member provided with a mouth, and a heat insulating material is provided between the field plate small edge surface contact portion and the small edge surface of the field plate, or between the field plate and the case-shaped member. The base plate is attached by being sandwiched between the base plate abutting portion and the case-like member.

  The ventilation member according to the present invention is configured by combining two members, a case-like member and an opening / closing member. That is, since the ventilation member can be configured by integrating the opening and closing member, in which the incombustible volume expansion material is previously stored in the storage portion, with the case-like member, the manufacture is easy.

  In addition, since the ventilation member can be attached to the front end portion of the field plate at the eaves, it is not necessary to configure a dedicated base and can be easily installed. For this reason, the fixing of the roofing material does not become unstable. In particular, since the ventilation member can be attached by sandwiching the field plate between the case-shaped member and the field plate contact piece, it is possible to work in a stable state during construction.

  In addition, since the base plate contact piece and the exterior material contact piece of the case-like member are formed substantially in parallel, they can be attached to the eaves without being affected by the gradient of the roof. For this reason, it can respond to the roof which has a different gradient by one case-like member and one opening-and-closing member, and there is no possibility that the number of parts may increase.

  In addition, heat is applied from the outside to the ventilation member by providing a heat insulating material between the field plate small edge surface contact portion and the small edge surface of the field plate or between the field plate and the case-like member However, this heat is not immediately transmitted to the field board.

It is sectional drawing explaining the structure of the ventilation member attached to the field plate | board of the eaves. It is a perspective view explaining the structure of a ventilation member. It is a figure explaining the structure of the case-like member and opening / closing member which comprise a ventilation member.

  As shown in FIG. 1, the ventilation member A according to the present invention is attached to an eaves field plate 1 and abuts against an upper end portion of an exterior material 2 such as an outer wall material or a nose cover plate via a caulking 3, Alternatively, the air passage 4 is formed between the lower surface of the base plate 1 and the upper end portion of the exterior material 2 by directly contacting. And it is comprised so that ventilation of the hut back 5 can be measured by ventilating the hut back 5 and the outdoors through this ventilation path 4.

  Attic ventilation can be achieved by ensuring sufficient ventilation area to ventilate the attic in the target building. For this reason, the area (the number of ventilation members A) of the external ventilation port (13a) and the back of the ventilation member (14) of the ventilation member A that can satisfy the ventilation area set in the target building is set, and An attachment position with respect to the main plate 1 is set.

  And the exterior material 2 arrange | positioned in the position which attaches the ventilation member A is raised to the height which an upper end part contact | abuts to the ventilation member A. FIG. Moreover, the exterior material 2 arrange | positioned in the position which does not attach the ventilation member A raises the upper end part to the field board 1. FIG. As described above, the exterior material 2 arranged at the position where the ventilation member A is attached or not attached can be dealt with simply by adjusting the standing upper limit of the upper end portion. Derive.

  A draining material 6 is attached to the eaves field plate 1 to which the ventilation member A is attached. The draining material 6 is formed in a square shape consisting of a fixing piece 6a and a shielding piece 6b. With the shielding piece 6b of the draining material 6 protruding, the fixing piece 6a is a fixture 9 such as a nail or a wood screw. It is being fixed to the field board 1 by. Then, the shielding piece 6b is arranged in front of the ventilation member A to prevent rainwater from directly flowing into the ventilation member A.

  A roof material 7 is laid on the top of the base plate 1 to which the draining material 6 is fixed, and a ridge 8 is provided at a portion corresponding to the lower end of the roof material 7. Therefore, rainwater that has fallen on the roofing material 7 in the rain falls from the end of the roofing material 7 and falls on the eaves 8 along the shielding piece 6 b of the draining material 6. Further, the rainwater that has slanted into the eaves directly falls on the eaves 8, or falls on the shielding piece 6 b of the draining material 6, and then falls on the eaves 8 along the shielding piece 6 b.

  Next, the configuration of the ventilation member A according to the present embodiment will be described. The ventilation device A according to the present embodiment is configured by combining a case-like member 10 formed of a metal plate and an opening / closing member 20 formed of a synthetic resin molding material.

  The case-like member 10 is configured as a member obtained by bending a metal plate, and has a preset length (for example, a dimension corresponding to a module dimension set for a building). Although it does not specifically limit as a material of a metal plate, It is preferable that it is excellent in workability and excellent in fire resistance. Examples of such a material include a steel plate and a stainless steel plate, and any of them can be preferably used. However, the case-like member 10 is not limited to being formed of a metal plate, and the case-like member 10 may be formed by bending or extruding a synthetic resin as a material.

  The case-like member 10 includes a field plate abutting piece 11 that serves as a field plate abutting portion that abuts the upper surface of the eaves field plate 1, and an upper end portion of the exterior member 2 that is disposed substantially parallel to the field plate abutting piece 11. The exterior material abutting piece 12 to be the exterior material abutting portion to be abutted, the external side ventilation piece 13 formed with the external side air vent 13a to be opened to the outside, and the shed back ventilation to be opened to the shed 5 side together with the opening / closing member 20. And a mouth 14.

  In the following description, there is a portion expressed as “contact” (contact portion, contact piece), but this contact is not necessarily in direct contact with the target object. The present invention is not limited to this, and includes objects in which other objects intervene between the target objects.

  The field board contact piece 11 is disposed on the lower surface side of the fixed piece 6a of the draining material 6 while contacting the upper surface of the field board 1 at the eaves edge. The base plate abutting piece 11 is shorter than the fixing piece 6 a of the draining material 6, and is formed so as to be closer to the eaves side than the fixing tool 9 when the fixing piece 6 a is fixed by the fixing tool 9.

  Continuing from the base plate abutting piece 11, a fore edge abutting piece 15 is formed that is bent at a substantially right angle with respect to the base plate abutting piece 11. The small edge abutment piece 15 does not directly contact the small edge surface of the base plate 1 but is brought into contact with the upright piece 24a of the contact portion 24 formed on the opening / closing member 20 described later and the heat insulating material 30. .

  In this embodiment, the small edge contact piece 15 is fixed to the small edge surface of the field plate 1 by the fixture 9 when the ventilation member A is attached to the field plate 1. For this reason, the small edge contact piece 15 has the dimension which added the dimension from the lower surface of the field board 1 of the to-be-fitted part 23 formed in the opening-and-closing member 20 mentioned later to the thickness of the field board 1. FIG. . Also, a pilot hole 15a is formed when the fixture 9 is used for fixing.

  However, when attaching the ventilation member A to the field board 1 at the eaves end, as described above, it is not limited to attaching to the small surface of the field board 1 by the fixture 9 using the small edge contact piece 15. Of course, the main plate contact piece 11 may be used for fixing.

  A fitting portion 16 is formed continuously with the fore edge contact piece 15. The fitting portion 16 includes a refracting piece 16 a bent at a right angle from the end of the fore edge contact piece 15 toward the lower side of the base plate contact piece 11, and a fitted portion 23 formed on the opening / closing member 20. The fitting projection 16b is formed in a portion corresponding to the fitting recess 23b, and the folded piece 16c is folded back in the original direction by the fitting projection 16b. The fitting protrusion 16b is formed by bending a bent piece 16a and a folded piece 16c into a curved shape. The length from the fore edge contact piece 15 to the fitting protrusion 16b is formed to be substantially equal to the dimension from the upright piece 24a of the fitted portion 23 formed on the opening / closing member 20.

  An external ventilation piece 13 is formed in an oblique direction from the end of the folded piece 16c constituting the fitting portion 16 to the front (left side in FIGS. 1 to 3) and downward. A plurality of external vents 13a are formed in the external vent 13 with a constant interval. The dimensions of the external vent 13a are not particularly limited, and are preferably set as appropriate according to conditions such as the material and thickness of the metal plate constituting the case-like member 10.

  In particular, the length and inclination angle of the external ventilation piece 13 are not particularly limited. However, the external ventilation piece 13 is disposed so as to protrude from the eaves to the outside, and when the protrusion length increases, the dimensions of the draining material 6 and the position of the ridge 8 are affected. For this reason, it is preferable to set suitably the length and inclination | tilt angle of the external side ventilation piece 13 according to the surrounding conditions in a building.

  The exterior material abutment piece 12 may be formed continuously with the external ventilation piece 13, but in this embodiment, a connecting piece 17 is formed between the external ventilation piece 13 and the exterior material contact piece 12. Has been. That is, a connecting piece 17 is formed which is continuous with the external ventilation piece 13 and bent at an angle substantially perpendicular to the base plate abutting piece 11. A contact piece 12 is formed.

  Further, as shown in FIG. 2, the exterior material abutting piece 12 is formed with a water draining hole 12a, and rain water blown from the external vent 13a or water accumulated by dew condensation is put into the bowl 8. It is configured so that it can be dropped.

  The exterior material abutting piece 12 is formed with a length that allows the end on the rear side (the right side in FIGS. 1 to 3) to reach the cabin back 5. Further, an upright piece 18a is formed at a substantially right angle from the rear side end portion of the exterior material abutting piece 12 toward the lower surface of the base plate 1, and at the tip of the upright piece 18a at a substantially right angle toward the front. A bent valve seat piece 18b is formed.

  The opening / closing member 20 is formed as a synthetic resin extrusion molding material, and has dimensions corresponding to the module dimensions set in the building, as with the case-like member 10. The opening / closing member 20 is disposed inside the case-like member 10 and integrated with the ventilation member A.

  The material of the synthetic resin constituting the opening / closing member 20 is not particularly limited, and is preferably excellent in durability and weather resistance. However, the opening / closing member 20 is not limited to being formed of a synthetic resin, and can be formed by extrusion molding a metal typified by aluminum.

  The opening / closing member 20 is disposed inside the case-like member 10, and is opened and closed by an on-off valve 21 that is actuated by wind to close the ventilation path 4 from the outside-side vent 13 a to the hut vent 14. A housing portion 22 that can be disposed and can accommodate a nonflammable volume expansion member 31 that expands by heat, and a fitted portion 23 that can be fitted to the fitting portion 16 formed in the case-like member. Has been.

  In addition, after the opening / closing member 20 is incorporated in the case-like member 10 to form the ventilation member A, when the ventilation member A is attached to the field plate 1 of the eaves, the small edge surface of the field plate 1 and It is comprised so that it can contact | abut to a lower surface. For this reason, the opening / closing member 20 has an L-shaped contact portion 24, and the standing piece 24 a of the contact portion 24 contacts the small edge surface of the field plate 1, and the horizontal piece 24 b contacts the lower surface of the field plate 1. Configured to get. The small edge contact piece 15 of the case-like member 10 and the refraction piece 16a of the fitting portion 16 are in contact with the base plate 1 via the contact portion 24 of the opening / closing member 20, respectively.

  The on-off valve 21 is formed to hang from a predetermined position on the rear side of the horizontal piece 24 b of the contact portion 24. The on-off valve 21 includes a valve body 21a and a flexible swinging piece 21b. The on-off valve 21 is adapted to the flow of air (wind) flowing through the ventilation path 4 formed in the ventilation member A. It is configured to be able to swing in response. For this reason, the valve body 21a is formed so as to exhibit a function as a pendulum having an appropriate weight, and the swing piece 21b has extremely small rigidity so that the valve body 21a can easily swing (the valve body 21a). It is formed so as to be sufficiently thin with respect to the thickness.

  When the valve element 21a constituting the on-off valve 21 swings backward and comes into contact with the valve seat piece 18b formed on the case-like member 10, the shed air vent 14 can be closed to block the air flow. It is configured as follows. In particular, the on-off valve 21 is formed continuously in the longitudinal direction of the on-off member 20 so that air does not leak from the valve body 21a and the sliding piece 21b.

  The accommodating part 22 is formed in front of the on-off valve 21 in the horizontal piece 24 b of the abutting part 24. The accommodating portion 22 has a U-shaped cross section including a pair of holding pieces 22a and 22b and a connecting piece 22c for connecting the holding pieces 22a and 22b. Further, the front holding piece 22a is formed with a water return piece 22d extending further forward and downward.

  A non-combustible volume expansion member 31 is fitted between the holding pieces 22 a and 22 b of the housing portion 22. The non-flammable volume expansion member 31 is an expandable graphite-based flameproof and smokeproof sealant, and has a property of starting to expand at a passing hot air temperature of about 180 ° C. and expanding ten times. As the incombustible volume expansion material 31, for example, “Inzmex (trade name)” manufactured by Austrian Chemie Linz and various incombustible volume expansion materials can be applied.

  The connecting piece 22c of the accommodating portion 22 is formed to be separated from the horizontal piece 24b of the contact portion 24, and a fitted portion 23 is formed between the connecting piece 22c and the horizontal piece 24b. . The fitted portion 23 includes a parallel portion 23a in which the bent piece 16a and the folded piece 16c constituting the fitting portion 16 of the case-like member 10 are fitted, and a fitting concave portion 23b in which the fitting protrusion 16b is fitted. And is configured.

  In the case-like member 10 and the opening / closing member 20 configured as described above, since the non-flammable volume expansion member 31 is accommodated in the accommodating portion 22 of the opening / closing member 20, the non-flammable volume expansion member 31 is attached to the case-like member 10. There is no need to form or paste the parts. In addition, since the on-off valve 21 is formed on the on-off member 20, it is not necessary to form a sliding member constituting the on-off valve on the case-like member 10. For this reason, the structure of the case-like member 10 is simplified, and it is easy to manufacture without requiring complicated molding.

  In addition, since the opening / closing member 20 is formed by extrusion molding of synthetic resin or the like, it is possible to ensure high dimensional accuracy and manufacture is extremely easy. For this reason, it is possible to form the swinging piece 21b of the on-off valve 21 with high accuracy to realize the reliable swinging of the valve body 21a.

  Next, a description will be given of a procedure in which the ventilation member A is configured by combining the case-like member 10 and the opening / closing member 20 configured as described above, and the ventilation member A is attached to the field board 1 at the eaves.

  First, the incombustible volume expansion member 31 is fitted and accommodated in the accommodating portion 22 of the opening / closing member 20. Since this operation can be performed by inserting the non-combustible volume expansion member 31 between the holding pieces 22a and 22b of the opened accommodating portion 22, the conventional operation (for example, the non-combustible volume on the inner surface of the ventilation member). It is extremely easy compared to attaching an expansion member. Moreover, the heat insulating material 30 is attached to the upright piece 24a and the horizontal piece 24b of the contact part 24.

  Next, the fitting portion 16 of the case-like member 10 is fitted to the fitted portion 23 of the opening / closing member 20 to combine both. That is, the fitting protrusion 16b of the fitting portion 16 is the fitting concave portion 23b of the fitting portion 23, and the overlapping portion of the bending piece 16a and the folded piece 16c of the fitting portion 16 is the parallel portion of the fitting portion 23. It is made to integrate by inserting corresponding to 23a. And the ventilation member A as shown in FIG. 2 can be comprised by making the edge part of the longitudinal direction of the case-like member 10 and the edge part of the longitudinal direction of the opening-and-closing member 20 correspond.

  The ventilation member A configured as described above is attached to the eaves field plate 1 by sandwiching the tip portion of the field plate 1 between the field plate contact piece 11 and the opening / closing member 20 of the case member 10, This is performed by fixing the opening / closing member 20 to the base plate 1 with the fixture 9.

  That is, the ventilation member A is arranged on the field board 1 corresponding to a preset position in the building. The base plate abutting piece 11 is brought into contact with the upper surface of the field plate 1, and the standing piece 24a and the horizontal piece 24b of the abutting portion 24 of the opening / closing member 20 are brought into contact with the small edge surface and the lower surface of the field plate 1. The leading end portion of the base plate 1 is sandwiched between U-shaped portions constituted by the pieces 11, 24a, 24b. In this state, by using the prepared hole 15a formed in the small edge contact piece 15 of the case-like member 10, the standing piece 24a and the heat insulating material 30 are penetrated and the fixture 9 is driven into the small edge surface of the base plate 1. The ventilation member A can be attached to the field plate A at the eaves.

  After attaching the ventilation member A to the base plate 1 at the eaves end, the caulking 3 closes the gap between the exterior material abutting piece 12 of the case-like member 10 and the upper end portion of the exterior material 2, so that the cabin is located inside the ventilation member A. An air passage 4 that connects the back 5 and the outside is formed. Thus, when the ventilation member A is attached to the field board 1 at the eaves edge, the ventilation path 4 is partitioned from the outside by the metal case-like member 10, so that the ventilation path 4 having excellent fire resistance can be configured. Is possible.

  In particular, since the on-off valve 21 is formed in the ventilation path 4, when wind or rainwater enters from the external side vent 13a during wind and rain, the valve body 21a is oscillated by this wind and contacts the valve seat piece 18b. Thus, it is possible to block the ventilation path 4 and prevent the rainwater from entering the cabin. Therefore, it is possible to improve waterproofness. Then, the rainwater that has entered the inside of the air passage 4 is discharged to the trough 8 through the hole 12 a formed in the exterior material abutting piece 12.

  In addition, since the incombustible volume expansion member 31 is disposed in the ventilation path 4, when the temperature of the ventilation member A rises, the incombustibility volume expansion member 31 expands to block the ventilation path 4, thereby Can be blocked. Therefore, it is possible to improve fire resistance.

  Further, by using a non-combustible heat insulating material as the heat insulating material 30 or by providing a gap without directly contacting the case-like member 10 and the base plate 1, the heat conduction of the ventilation member A that has received a flame or hot air. It is possible to reduce carbonization of the base plate 1. In other words, when the outer wall is directly in contact with Hirokomai, the outside of the building and the attic space will be close to each other, which may cause anxiety about the fireproofing of the attic against the fire that occurs around the building. By providing 30, it is possible to eliminate this anxiety.

  The ventilation member according to the present invention can be used with one model regardless of the slope of the roof, and can therefore be used when ventilating the roofs of all roofs having field boards.

A Ventilation member 1 Field plate 2 Exterior material 3 Caulking 4 Ventilation channel 5 Back of hut 6 Drainage material 6a Fixing piece 6b Shielding piece 7 Roof material 8 片 9 Fixing tool 10 Case-like member 11 Field plate contact piece 12 Exterior material contact piece 12a hole 13 external side ventilation piece 13a external side ventilation hole 14 hut back ventilation hole 15 small edge contact piece 15a pilot hole 16 fitting part 16a refraction piece 16b fitting protrusion 16c folding piece 17 connecting piece 18a standing piece 18b valve seat piece DESCRIPTION OF SYMBOLS 20 Opening-closing member 21 Opening-closing valve 21a Valve body 21b Peristaltic piece 22 Accommodating part 22a, 22b Holding piece 22c Connection piece 22d Water return piece 23 Fit part 23a Parallel part 23b Fitting recessed part 24 Contact part 24a Standing piece 24b Horizontal piece 30 Insulation 31 Nonflammable Volume Expansion Member

Claims (3)

A field plate contact portion that contacts the upper surface of the eaves field plate,
An exterior material abutting portion that is arranged substantially parallel to the base plate abutting portion and abuts on an upper end portion of the exterior member, an external vent that opens to the outside, and a hut vent that opens to the back of the shed. A case-like member provided,
An on-off valve that is arranged inside the case-like member and is operated by wind to block the air passage from the external vent to the cabin vent, and an incombustible volume that is arranged inside the case-like member and expands by heat An opening / closing member provided with an accommodating portion that can accommodate an expansion member, and a fitted portion that can be fitted with a fitting portion formed on the case-like member,
The opening / closing member is attached to the case-like member by fitting the fitting portion and the fitted portion,
A ventilation member attached to the field plate by being sandwiched between the field plate contact portion and the case-like member.   The ventilation member according to claim 1, wherein a noncombustible volume expansion member is provided in the housing portion. A field plate contact portion that contacts the upper surface of the eaves field plate,
Connected to the field plate contact portion, a field plate small edge surface contact portion that contacts the small edge surface of the field plate,
An exterior material abutting portion that is arranged substantially parallel to the base plate abutting portion and that contacts the upper end of the exterior material, an external vent that opens to the outside, and a hut vent that opens to the back of the shed A case-like member,
A heat insulating material is provided between the field plate small edge surface contact portion and the small edge surface of the field plate or between the field plate and the case-like member,
A ventilation member attached to the field plate by being sandwiched between the field plate contact portion and the case-like member.

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