JP6744148B2 - Ventilation structure in the building - Google Patents

Description

The present invention relates to a ventilation structure in a building.

Generally, a gap of about 10 mm to 30 mm, which is called an undercut, is provided between the lower end of the door (interior door) in the building and the floor. This gap is a gap for ventilation for 24 hours in the building and constitutes a ventilation path between two adjacent rooms (for example, a living room and a corridor).

However, if there is a gap of 10 mm to 30 mm between the lower end of the interior door and the floor, the risk of stuffing the fingers of the baby is increased. Therefore, various proposals have been conventionally made to prevent finger jamming between the lower end of the interior door and the floor.

For example, Japanese Unexamined Patent Application Publication No. 2011-144545 (Patent Document 1) discloses a technique of preventing the toe stuffing while maintaining ventilation performance by providing a toe stuffing prevention material on the lower surface of the hinged door at the door tip side. ..

Further, Japanese Patent Laying-Open No. 2007-9647 (Patent Document 2) discloses a technique in which the covering material can be attached to the entire lower end of the door only while there are infants in the home.

JP, 2011-144545, A (patent No. 5333247). JP, 2007-9647, A

In Patent Document 1, since the foot-stuffing prevention material is provided only on the door tip side of the lower surface of the door, there is still a gap where the baby's finger can be sandwiched in the portion where the foot-stuffing prevention material is not provided. Therefore, with such a door structure, finger stuffing cannot be completely prevented, and the parents of the infant remain anxious.

On the other hand, in Patent Document 2 described above, since the covering material is attached to the entire lower end of the door, the risk of finger packing for infants is reduced. However, since the ventilation is insufficient during the period when the covering material is attached, that is, when the baby is in the home, it is not desirable to simply close the gap under the door. Further, since the covering material is attached to the entire lower end of the door, the covering material stands out, which is not desirable in terms of design.

The present invention has been made to solve the above problems, and an object thereof is to provide a ventilation structure in a building capable of maintaining good ventilation performance while preventing finger stuffing. It is to be.

A ventilation structure in a building according to an aspect of the present invention is a ventilation structure between two adjacent rooms in the building, and includes a partition wall, a door frame, an interior door, and an upper clearance. The partition wall is located between the two chambers and has an opening communicating between the two chambers. The door frame includes a pair of side members fixed to both sides of the opening and an upper member fixed to an upper end of the opening. The interior door is attached to the door frame and the opening can be opened and closed. The upper gap is provided between the upper end of the interior door and the upper member of the door frame in the closed state, and forms a ventilation path between the two chambers.

Preferably, the ventilation structure further comprises a lower gap provided between the lower end of the interior door in the closed state and the bottom surface of the opening facing the lower end of the interior door, and both the upper gap and the lower gap are It constitutes a ventilation path between two rooms.

The height dimension of the lower gap is preferably 5 mm or less.

The height dimension of the upper clearance is preferably larger than the height dimension of the lower clearance.

The total opening area of the upper gap and the lower gap is preferably 100 cm ² or more and 150 cm ² or less.

Preferably, the ventilation structure further includes a light shielding unit for preventing light from leaking between the two chambers via the upper gap.

It is desirable that the light shielding means is provided on the upper member of the door frame and, in the closed state, is spaced apart from the front side which is the opening side or the back side which is the closing side of the interior door.

Alternatively, the upper member of the door frame may be provided with an upper door stop that is in contact with the rear surface of the upper end of the interior door and constitutes a light-shielding unit. In this case, it is desirable that an air passage communicating with the upper gap be formed in the upper door rest.

According to the present invention, it is possible to maintain good ventilation performance while preventing finger jamming.

It is a front view which shows typically the ventilation structure in the building which concerns on Embodiment 1 of this invention. It is sectional drawing which shows typically the ventilation structure in the building which concerns on Embodiment 1 of this invention. In Embodiment 1 of this invention, it is a figure which shows typically the positional relationship of the upper member of a door frame, and an interior door. It is sectional drawing which shows typically the ventilation structure in the building which concerns on Embodiment 2 of this invention. In Embodiment 2 of this invention, it is a figure which shows typically the positional relationship of a light-shielding means and an interior door. In Embodiment 2 of this invention, it is a figure which shows typically the other structural example of the shielding member which comprises a light-shielding means. It is a figure which shows typically the light-shielding means in the modification 1 of Embodiment 2 of this invention. It is a figure which shows typically the light-shielding means in the modification 2 of Embodiment 2 of this invention. It is sectional drawing which shows typically the ventilation structure in the building which concerns on Embodiment 3 of this invention. In Embodiment 3 of this invention, it is a figure which shows typically the positional relationship of the upper door and the interior door which comprise a light-shielding means. It is sectional drawing which shows typically the upper door rest in the modification 1 of Embodiment 3 of this invention. It is sectional drawing which shows typically the upper door stop in the modification 2 of Embodiment 3 of this invention. It is sectional drawing which shows typically the upper door stop in the modification 3 of Embodiment 3 of this invention. It is sectional drawing which shows the ventilation structure in a general building typically.

Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts will be denoted by the same reference characters and description thereof will not be repeated.

<Embodiment 1>
The ventilation structure 1 in the building according to the present embodiment will be described with reference to FIGS. 1 to 3. The ventilation structure 1 is a ventilation structure between two adjacent rooms R1 and R2 in a building, and is adopted for 24 hours ventilation of the building.

The two chambers R1 and R2 are partitioned by a partition wall 11 extending upward from the floor surface 13 to the ceiling surface 14. The partition wall 11 has an opening 12 that connects the chambers R1 and R2. The ventilation structure 1 includes, as a basic configuration, a door frame 2 attached to the partition wall 11, and an interior door 3 attached to the door frame 2 and capable of opening and closing the opening 12. The "room" means a space partitioned by the partition wall 11 in the building, and includes not only living rooms such as living rooms and bedrooms but also non-living rooms such as corridors and washrooms.

The interior door 3 is a so-called hinged door. In the following description, the opening direction of the interior door 3 is referred to as the front and the closing direction is referred to as the rear. In the present embodiment, it is assumed that the room R1 is opened. The surface of the interior door 3 on the room R1 side (front side) is called the front surface 3a, and the surface on the room R2 side (rear side) is called the back surface 3b. The arrow A1 in FIG. 1 indicates the width direction of the interior door 3. The arrow A2 in FIG. 2 indicates the opening direction (front) of the interior door 3, and the direction opposite to the arrow A2 indicates the closing direction (rear) of the interior door 3. Handles 32 for opening and closing the interior door 3 are provided on the front surface 3 a and the back surface 3 b of the interior door 3.

The door frame 2 includes a pair of side members 21 and 22 fixed to both sides of the opening 12, and an upper member 23 fixed to an upper end of the opening 12. The interior door 3 is rotatably attached to one side member 21 of the door frame 2 via a hinge 31. The other side member 22 of the door frame 2 is provided with a side door stop 24 that comes into contact with a door end side end portion (side rear surface) of the rear surface 3b of the interior door 3. The upper end surface 3c of the interior door 3 faces the lower surface 23a of the upper member 23 as the top surface of the opening 12, and the lower end surface 3d of the interior door 3 faces the floor surface 13 as the bottom surface of the opening 12.

In this way, in the case of the configuration in which the opening 12 serving as the entrance and exit between the rooms R1 and R2 is opened and closed by the interior door 3 which is a hinged door, generally, the room R1 is provided between the interior door 3 and the floor surface 13. , R2 is provided for ventilation. A general ventilation structure 101 in a building will be briefly described with reference to FIG.

As shown in FIG. 14, the ventilation structure 101 includes a gap 141 that forms a ventilation path between the lower end portion (lower end surface 3d) of the interior door 3 and the floor surface 13. On the other hand, there is no gap intended for ventilation between the door frame 102 and both sides and the upper end (upper end surface 3c) of the interior door 3. In this case, the door frame 102 includes not only the side door stops 24 that come into contact with the side back surfaces of the interior door 3 but also the upper door 125 that comes into contact with the upper end (upper back surface) of the back surface 3 b of the interior door 3. Have The upper door support 125 is usually provided integrally with the upper member 123.

In such a general ventilation structure 101, the height dimension of the gap 141 below the interior door 3 (that is, the interval between the floor surface 13 and the lower end surface 3d of the interior door 3) L10 is 10 mm to 30 mm. Considering the survey results that the thickness (height) of the thickest toe (thumb) in a standing state of infants 1 to 3 years old is 6 mm to 20 mm, when the gap 141 is near 30 mm, The toes completely fit into the gap 141. Even if the gap 141 is about 10 mm to 15 mm, thin toes (such as the little finger) may enter the gap 141. In addition, since the thickness of the fingers in the high-high state (the state where the palm and knees are raised on the floor and crawled on all fours) is smaller than the thickness of the toes, the fingers of an actively moving infant are caught in the gap 141. The possibility is high.

Therefore, in the present embodiment, as shown in FIGS. 1 and 2, an upper gap 42 that contributes to ventilation is provided between the upper end surface 3c of the interior door 3 and the upper member 23. The height dimension L2 of the lower gap 41 between the lower end surface 3b of the door 3 and the floor surface 13 is set to a height at which it is difficult for the infant to catch the fingers. In the present embodiment, since the upper gap 42 constitutes the ventilation path in this manner, as shown in FIG. 3, the upper member 23 of the door frame 2 has the upper door support 125 as shown in FIG. Not provided. In FIG. 3, the position of the interior door 3 in the closed state is shown by an imaginary line for easy understanding.

The height L2 of the lower clearance 41 is preferably 5 mm or less in order to prevent finger packing of infants, and is preferably 3 mm or higher so that the lower clearance 41 can also contribute to ventilation. As described above, it is desirable that the ventilation path between the two chambers R1 and R2 is configured not only by the upper gap 42 but by both the upper gap 42 and the lower gap 41.

The height dimension L2 of the lower clearance 41 may be 1 mm to 2 mm when considering only the circumstances such as the construction accuracy of the interior door 3 and aging, but the lower clearance 41 should also function as a part of the ventilation path. Since the ventilation paths are distributed above and below the interior door 3, it is possible to prevent the height dimension L1 of the upper clearance 42 from increasing.

The height dimension L1 of the upper gap 42 is larger than the height dimension L2 of the lower gap 41. Specifically, the height dimension L1 of the upper gap 42 is at least 5 mm or more, and preferably 8 mm or more. Further, the height dimension L2 of the upper gap 42 is preferably 10 mm or less in order to suppress light leakage and sound leakage through the upper gap 42.

As described above, the ventilation amount between the chamber R1 and the chamber R2 is larger in the upper ventilation path formed by the upper gap 42 than in the lower ventilation path formed by the lower gap 41. Note that the height dimensions of the lower gap 41 and the upper gap 42 are not limited to the above examples, but the sum of the height dimension L1 of the upper gap 42 and the height dimension L2 of the lower gap 41 is 10 mm or more and 30 mm or less. Is desirable. In addition, the total opening area of the upper gap 42 and the lower gap 41 is preferably 100 cm ² or more and 150 cm ² or less in consideration of measures against sick houses.

As described above, according to the ventilation structure 1 of the present embodiment, it is possible to realize the maintenance of ventilation performance and the prevention of finger stuffing with a simple configuration in which the upper gap 42 is made larger than the lower gap 41. it can. Therefore, it is not necessary to provide accessory parts or the like for preventing finger jamming at the lower end portion of the interior door 3, so that the designability can be improved. Further, according to the present embodiment, finger stuffing can be prevented without incurring extra cost. Therefore, the ventilation structure 1 of the present embodiment has high versatility and can be applied to various buildings.

Further, by making the upper gap 42 larger than the lower gap 41, it is possible to prevent the feet from being cold due to the cold air entering through the lower gap 41 in winter.

<Second Embodiment>
With reference to FIG. 4 and FIG. 5, the ventilation structure 1A in the building according to the present embodiment will be described. Since the basic structure of the ventilation structure 1A is the same as that of the ventilation structure 1 of the first embodiment, only the parts different from the first embodiment will be described below in detail.

1 A of ventilation structures which concern on this Embodiment are equipped with the light shielding means provided in the upper member 23 of the door frame 2, ie, the opaque shielding member 5. The shielding member 5 is arranged with a space between it and the back surface 3b of the interior door 3, and is provided so as to project below the lower surface 23a of the upper member 23. The shielding member 5 is made of a hard material and is made of the same material (wood, resin, etc.) as the upper member 23, for example.

As shown in FIG. 5, the shielding member 5 is a long member that extends over the entire width between the side members 21 and 22 of the door frame 2, and is a joint member (not shown) such as a bolt or an adhesive. It is fixed to the upper member 23 by (No.). Referring to FIG. 4, the height dimension of the shielding member 5 (the length from the lower surface 23a of the upper member 23 to the tip position of the shielding member 5) L3 is larger than the height dimension L1 of the upper gap 42 (FIG. 2). large. By attaching such a shielding member 5 to the upper member 23, it is possible to prevent light leakage between the two chambers R1 and R2 via the upper gap 42.

For example, when the air flows from the chamber R1 toward the chamber R2, the air in the chamber R1 is sent to the chamber R2 by changing its course downward by hitting the shielding member 5 after passing through the upper gap 42. The distance L4 between the back surface 3b of the interior door 3 and the shielding member 5 is preferably equal to or greater than the height dimension L1 of the upper gap 42 so that the ventilation performance is not deteriorated by providing the shielding member 5. That is, the distance L4 is preferably 8 mm or more.

According to such a configuration, for example, when the room R1 is a bedroom and the room R2 is a corridor, it is possible to reduce the inconvenience that the illumination light of the room R2 leaks into the room R1 from the upper gap 42 when sleeping in the room R1. be able to. Therefore, even if the upper gap 42 located above the occupant's eyes is made larger than the lower gap 41, the occupant can spend comfortably.

The shielding member 5 does not have to be a block-shaped member having a large thickness as shown in FIG. 4, but may be a plate-shaped member having a small thickness. Further, in the present embodiment, the shielding member 5 is a single member attached to the upper member 23, but may be integrally provided on the upper member 23.

Further, as in the shielding member 5A shown in FIG. 6, it may have a plurality of protruding portions 53 protruding forward. The plurality of protrusions 53 are provided at intervals in the width direction. The plurality of protrusions 53 contact the rear surface of the upper end of the interior door 3 in the closed state. That is, the plurality of protrusions 53 function as an upper door stop. In such a case, compared with the case where the door frame 2 is not provided with an upper door stop, it is possible to suppress secular changes such as warpage of the upper end of the interior door 3.

The mounting position or the material of the light shielding means for preventing light leakage between the two chambers R1 and R2 via the upper gap 42 may be other than the above. Hereinafter, modified examples of the present embodiment will be described.

(Modification 1)
FIG. 7 is a diagram schematically showing the light shielding means in the first modification of the present embodiment. The light shielding means in the present modification is realized by the shielding member 5B arranged on the front surface 3a side of the interior door 3.

The shielding member 5B is arranged with a space from the surface 3a of the interior door 3, and is provided so as to project below the lower surface 23a of the upper member 23. The height dimension of the shielding member 5B (the length from the lower surface 23a of the upper member 23 to the tip position of the shielding member 5B) may be the same as the dimension L3 shown in FIG. Further, the distance between the surface 3a of the interior door 3 and the shielding member 5B may be the same as the distance L4 shown in FIG.

The shielding member 5B is made of a soft material such as thick light-shielding cloth. Therefore, when the interior door 3 is opened/closed, the shielding member 5B is pushed by the upper end portion (front surface 3a or back surface 3b) of the interior door 3 to be deformed, so that the opening/closing operation of the interior door 3 is not hindered.

In the present modification, when the interior door 3 is closed and, for example, air flows from the room R1 toward the room R2, the air in the room R1 is from below between the shielding member 5B and the surface 3a of the interior door 3. It enters the gap, passes through the upper gap 42, and is sent to the chamber R2 as it is (without changing the course).

(Modification 2)
FIG. 8 is a diagram schematically showing the light shielding means in the second modification of the present embodiment. The light shielding means in this modification is realized by a shielding member 5C fixed to the upper end of the interior door 3.

5 C of shielding members are hard members (for example, metal fittings) which have an L-shaped cross section, for example. The shielding member 5C includes a fixed protrusion 51 that is fixed to the upper end surface 3c of the interior door 3 and protrudes forward of the surface 3a of the interior door 3, and a rising portion 52 that rises upward from the tip of the fixed protrusion 51. To be done. The height dimension of the rising portion 52 (the length from the upper end surface 3c of the interior door 3 to the tip position of the rising portion 52) may be the same as the dimension L3 shown in FIG. The size may be smaller than the dimension L1 (FIG. 2). Further, the distance between the rising portion 52 and the upper member 23 in the front-rear direction may be the same as the distance L4 shown in FIG.

In the present modification, when the interior door 3 is closed and, for example, air flows from the room R1 toward the room R2, the air in the room R1 flows from above between the rising portion 52 of the shielding member 5C and the upper member 23. Into the room R2, passes through the upper clearance 42, and is sent to the room R2 as it is (without changing the course).

<Third Embodiment>
With reference to FIG. 9 and FIG. 10, the ventilation structure 1B in the building according to the present embodiment will be described. Since the basic structure of the ventilation structure 1B is the same as that of the ventilation structure 1 of the first embodiment, only the parts different from the first embodiment will be described below in detail.

The ventilation structure 1B according to this embodiment includes an upper door support 6 attached to the upper member 23 of the door frame 2. The upper door rest 6 is a long member that extends over the entire width between the side members 21 and 22 of the door frame 2. The height dimension of the upper door support 6 (the length from the lower surface 23a of the upper member 23 to the lower end position of the upper door support 6) is larger than the height dimension L1 of the upper gap 42 (FIG. 2), Includes an abutting portion 62 that comes into surface contact with the back surface 3b of the interior door 3.

The upper door support 6 is formed of a non-translucent hard material (for example, metal, resin, etc.). Therefore, similarly to the shielding member shown in the second embodiment, the upper door support 6 functions as a light shielding unit. Further, the upper door support 6 is formed with a ventilation path 60 communicating with the upper gap 42. In the present embodiment, the upper gap 42 and the air passage 60 form an upper ventilation path between the two chambers R1 and R2. Therefore, by attaching the upper door rest 6 to the upper member 23, it is possible to prevent air from leaking between the chambers R1 and R2 while allowing ventilation between the two chambers R1 and R2 via the upper gap 42. it can.

A specific configuration example of the upper door 6 is as follows. That is, the upper door rest 6 includes, in addition to the contact portion 62, the fixing portion 65, the shielding portion 61, the bottom wall portion 66, and the ventilation openings 63 and 64. The fixing portion 65 is in surface contact with the lower surface 23a of the upper member 23, extends in the width direction, and is fixed to the upper member 23 by a joining member. The shield 61 is connected to the rear end of the fixed portion 65 and extends in the vertical direction at a position away from the back surface 3b of the interior door 3. The lower end position of the shielding part 61 is, for example, the same height as the lower end position of the contact part 62. The bottom wall portion 66 connects the lower end of the shield portion 61 and the lower end of the contact portion 62, and extends, for example, in the horizontal direction.

The ventilation opening 63 is provided between the fixed portion 65 and the upper end of the contact portion 62, and faces the upper gap 42. The ventilation opening 64 is provided in the bottom wall portion 66. Specifically, a plurality of ventilation openings 64 are provided along the width direction at intervals. As described above, in the present embodiment, the ventilation opening 63 is arranged so as to face forward, and the ventilation opening 64 is arranged so as to face downward. The upper door rest 6 includes a vertical plate portion (not shown) that has the contact portion 62 in the lower portion and connects the fixing portion 65 and the bottom wall portion 66, and a plurality of vertical plate portions are provided above the vertical plate portion. The ventilation opening 63 may be formed.

For example, when the air flows from the chamber R1 to the chamber R2, the ventilation passage 60 has a ventilation opening 63 facing the upper clearance 42 and serving as an air inlet, and a ventilation opening 64 facing the space in the chamber R2 and serving as an air outlet. And a cavity 67 extending from the ventilation opening 63 to the ventilation opening 64. When air flows from the chamber R2 to the chamber R1, the ventilation opening 64 serves as an air inlet and the ventilation opening 63 serves as an air outlet. Since the ventilation openings 63 and 64 do not face each other, the ventilation path 60 serves as a path for bypassing air.

When such an upper door rest 6 is fixed to the upper member 23, the air in the chamber R1 passes through the upper gap 42 and the ventilation opening 63, flows into the hollow portion 67, and strikes the shielding portion 61 to travel along the path. It changes to the downward direction and is sent to the chamber R2 through the ventilation opening 64.

By providing the upper door support 6 with the ventilation function and the light blocking function as in the present embodiment, it is possible to suppress the secular change of the interior door 3 while achieving the same effect as in the second embodiment.

The structure of the upper door support 6 is not particularly limited as long as the upper door support 6 has a ventilation function and a light blocking function. That is, the bypass path (ventilation path 60) for air is not limited to the example shown in FIG. 9. Hereinafter, modified examples of the present embodiment will be described.

(Modification 1)
FIG. 11 is a cross-sectional view schematically showing the upper door support 6A in the first modification of the present embodiment. The upper door support 6A has a partition 69 that is bent rearward (toward the shield 61) from the upper end of the contact portion 62. A gap is provided between the partition 69 and the shield 61, and the ventilation path 60A is configured to pass through this gap.

(Modification 2)
FIG. 12 is a cross-sectional view schematically showing an upper door support 6B in the second modification of the present embodiment. The ventilation opening 64 provided in the upper door support 6B is arranged not at the bottom wall portion 66 but below the shielding portion 61 and at a position facing the contact portion 62. That is, the ventilation opening 64 is arranged facing backward rather than downward. Also in this modified example, the height dimension of the shielding portion 61 is not less than the height dimension L1 (FIG. 2) of the upper gap 42. Therefore, the height of the upper end of the ventilation opening 64 is lower than the height of the upper end of the contact portion 62 (the height of the upper end surface 3c of the interior door 3).

In this case, the ventilation path 60B includes a ventilation opening 63 that faces the front, a ventilation opening 64 that faces the rear at a position lower than the ventilation opening 63, and a cavity 67 that connects the openings 63, 64. Therefore, when the air in the chamber R1 passes through the upper gap 42 and the ventilation opening 63, it slightly shifts its course downward and is sent from the ventilation opening 64 to the chamber R2.

(Modification 3)
FIG. 13: is sectional drawing which shows 6C of upper door locks in the modification 3 of this Embodiment typically. The ventilation opening 64 provided in the upper door support 6C faces rearward and is arranged at the same height as the ventilation opening 63.

In this case, the shielding portion 61 is provided between the ventilation opening 63 and the ventilation opening 64. A gap is provided between the lower end of the shielding portion 61 and the bottom wall portion 66, and the ventilation path 60C is configured to pass through this gap. Therefore, when the air in the chamber R1 passes through the upper gap 42 and the ventilation opening 63, it detours downward so as to pass under the shield 61, and is sent to the chamber R2 from the ventilation opening 64 facing rearward.

(Other modifications)
In the present embodiment and Modifications 1 to 3 above, the ventilation function and the light-shielding function are satisfied by devising the cross-sectional shape of the hard upper door support. It may be formed of a block-shaped member having. In other words, the light blocking means for preventing light from leaking between the chambers R1 and R2 through the upper gap 42 may be made of a porous member having air permeability (for example, sponge).

As described above, according to each of the embodiments (and the modified examples), it is possible to prevent finger jamming and maintain good ventilation performance. In each of the embodiments, the upper gap 42 and the lower gap 41 form the ventilation path between the chambers R1 and R2, but only the upper gap 42 may form the ventilation path. Alternatively, instead of/in addition to the lower gap 41, a side gap that contributes to ventilation may be provided between the side members 21 and 22 of the door frame 2 and the interior door 3.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

1,1A,1B,101 Ventilation structure, 2,102 Door frame, 3 Interior doors, 5,5A,5B,5C Shielding member, 6,6A,6B,6C,125 Upper door support, 11 partition walls, 12 openings , 13 floor surface, 14 ceiling surface, 21,22 side member, 23,123 upper member, 24 side door rest, 41,141 lower gap, 42 upper gap, 51 fixed protruding portion, 52 rising portion, 53 protruding portion , 60, 60A, 60B, 60C Ventilation path, 61 Shielding part, 62 Abutting part, 63,64 Venting opening, 65 Fixed part, 66 Bottom wall part, 67 Cavity part, 69 Partition part, R1, R2 chamber.

Claims (7)

A ventilation structure between two adjacent rooms in the building,
A partition wall that is located between the two chambers and has an opening that communicates between the two chambers;
A door frame including a pair of side members fixed to both sides of the opening, and an upper member fixed to an upper end of the opening,
An interior door attached to the door frame and capable of opening and closing the opening,
An upper gap which is formed by a gap between an upper end surface of the interior door in a closed state and a lower surface of an upper member of the door frame facing the interior door, and which constitutes a ventilation path between the two chambers ,
An upper door lock fixed to the upper member ,
The upper door stop extends in the width direction and abuts against the upper end of the interior door in a closed state, and a first ventilation located above the abutment and facing the upper gap. The opening, the facing portion that extends in the width direction facing the contact portion and the first ventilation opening, the lower end of the contact portion and the lower end of the facing portion extend, and extend in the width direction. A bottom wall portion and a second ventilation opening provided in the bottom wall portion or the facing portion,
A ventilation structure in a building, wherein an air passage extending from the first ventilation opening to the second ventilation opening is formed in the upper door stop . Further comprising a lower gap provided between a lower end of the interior door and a bottom surface of the opening facing the lower end of the interior door in a closed state,
The ventilation structure for a building according to claim 1, wherein both the upper gap and the lower gap form a ventilation path between the two rooms. The ventilation structure for a building according to claim 2, wherein the height dimension of the lower gap is 5 mm or less. The ventilation structure for a building according to claim 2 or 3, wherein the height dimension of the upper gap is larger than the height dimension of the lower gap. The ventilation structure in a building according to any one of claims 2 to 4, wherein an opening area in which the upper gap and the lower gap are combined is 100 cm ² or more and 150 cm ² or less. The ventilation structure for a building according to claim 1, further comprising a light-shielding unit for preventing light from leaking between the two rooms via the upper gap. Before SL shielding means, said is constituted by the facing portion of the upper Toto, ventilation structures in the building according to claim 6.

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