JP2010259239A - Airtight box cover, and method for installation of wiring box using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airtight box cover capable of viewing whether a part where air circulates through an airtight tape and an airtight sheet is present, and capable of reliably interrupting the part where air circulates, and to provide a method for installation of a wiring box using the airtight box cover. <P>SOLUTION: In the box cover 20, a flange 26 is integrally formed at the whole circumference of the opening edge of the opening 20a of a cover body 21. A double-sided tape 29 whose rear face is stuck to the whole circumference of the flange 26 and whose front face is stuck to the airtight sheet 34 is arranged in the flange 26. both sides of the double-sided tape 29 are formed in colored faces except for white. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an airtight box cover that is airtightly attached to an airtight sheet, and a wiring box installation method using the airtight box cover.

  A lightweight partition wall as a building wall is constructed by erecting a light-weight shaped steel material and erecting a wall material (for example, a gypsum board) so as to sandwich the light-weight shaped steel material. In the lightweight partition wall, a hollow portion is formed between a pair of wall materials, and a heat insulating member such as a foamed polystyrene plate, glass wool, or a hard foamed urethane plate is disposed in the hollow portion. For example, in order to improve indoor heating and cooling efficiency, an airtight sheet such as a polyethylene film is provided on the indoor side of the heat insulating member in the hollow portion so as to cover the heat insulating member. By this airtight sheet, the circulation between the outside air and the inside air is blocked, and the airtightness is improved, thereby improving the cooling and heating efficiency.

  In addition, in order to install the wiring device on the lightweight partition wall, a bottomed square box-like wiring box having an opening on the front surface is installed in the hollow portion. In order to prevent a decrease in airtightness due to the installation of the wiring box, the wiring box is housed in an airtight box cover formed by press molding or vacuum molding a flexible synthetic resin, for example, a polypropylene sheet. And as such an airtight box cover, there exists an airtight member of patent document 1, for example.

  The airtight member described in Patent Document 1 is integrally formed with a storage portion formed in a substantially box shape that opens on one surface, and a flange portion that protrudes outwardly in the outer peripheral direction at the opening edge of the storage portion. In addition, the wiring box is housed in the housing portion of the airtight member. An airtight sheet is airtightly attached to the flange portion of the airtight member with an airtight tape, and the airflow between the flange portion and the airtight sheet is sealed between the flange portion and the airtight sheet with an airtight tape. Is shut off. As a result, the circulation between the outside air and the inside air through the wiring box is blocked, and the deterioration of the airtightness is prevented.

JP-A-8-302838

  By the way, in the airtight member disclosed in Patent Document 1, air bubbles enter between the airtight sheet and the airtight tape, and the inside and the outside of the airtight box cover are communicated between the airtight sheet and the airtight tape, so that the air flows. A location for circulation may be formed, and the circulation between the outside air and the inside air may not be blocked. However, Patent Document 1 does not disclose at all whether or not a place where air flows is formed between the air-tight sheet and the air-tight tape, and the place where air flows is ensured. There was a problem that it could not be blocked.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to visually check whether there is a place where air flows between the airtight tape and the airtight sheet. Another object of the present invention is to provide an airtight box cover that can reliably block a place where air flows, and a wiring box installation method using the airtight box cover.

  In order to solve the above problems, the invention according to claim 1 is characterized in that the wiring box is accommodated behind the wall of the building and is airtight with respect to the transparent or translucent airtight sheet provided on the wall back. An airtight box cover to be attached, which has an opening on one side and a cover body formed in a bottomed box shape capable of accommodating the wiring box from the opening, and the entire periphery of the opening edge of the opening An annular flange portion extending outward from the cover main body, and one surface is adhered to the flange portion over the entire circumference of the flange portion, and the other surface is adhered to the airtight sheet. The gist is that an airtight tape is provided, and the other surface of the airtight tape is formed in a color other than white.

  According to a second aspect of the present invention, in the airtight box cover according to the first aspect, the flange portion is formed to be transparent or translucent, and one surface of the airtight tape is also formed to a color other than white. This is the gist.

  The invention according to claim 3 is an airtight box cover that is airtightly attached to a transparent or translucent airtight sheet provided on the back of the wall while housing the wiring box behind the wall of the building. A wiring box installation method used, wherein the airtight box cover has an opening on one side and a cover body formed in a bottomed box shape capable of accommodating the wiring box from the opening, and the opening And an annular flange portion extending from the entire periphery of the opening edge of the portion toward the outside of the cover main body, and the airtight box cover of the building in a state where the wiring box is accommodated in the cover main body. After fixing to the structure and sticking the flange part and the airtight sheet with an airtight tape, the adhesive surface of the airtight tape formed in a color other than white is viewed. And summarized in that viewing the adhered state between the airtight tape and the airtight sheet by.

  According to this invention, it is possible to visually recognize whether or not there is a place where air flows between the airtight tape and the airtight sheet, and it is possible to reliably block the place where air flows.

The perspective view which shows the wiring box and airtight box cover in this embodiment. The perspective view which shows the state by which the box cover for airtight which accommodated the wiring box inside was being fixed to the pillar. The perspective view which shows the state which covered the opening side in the airtight box cover with an airtight sheet | seat. Sectional drawing which shows the state which covered the opening side in the box cover for airtightness with an airtight sheet | seat. The top view which shows the double-sided tape in another embodiment. (A) is a top view of the box cover in another embodiment, (b) is a partially expanded perspective view of a double-sided tape.

An embodiment of an airtight box cover embodying the present invention will be described below with reference to FIGS.
First, the wiring box 11 will be described.

  As shown in FIG. 1, the wiring box 11 is formed in a bottomed square box shape having an opening on one surface by a synthetic resin material. Specifically, the wiring box 11 is formed of a rectangular bottom wall 12 and four side walls 13 a to 13 d erected from the periphery of the bottom wall 12. In the following description, the short side walls facing vertically in FIG. 1 are referred to as an upper side wall 13a and a lower side wall 13b, and the long side walls facing left and right in FIG. 1 are referred to as a right side wall 13c and a left side wall 13d.

  Two cable insertion holes 15 are formed in the upper side wall 13a and the lower side wall 13b. One cable insertion hole 15 is closed by a knock part 14, and the other cable insertion hole 15 is not formed with a knock part 14 and is opened. A boss portion 19 used for attaching a wiring device (not shown) to the wiring box 11 is formed on the inner surfaces of the upper side wall 13a and the lower side wall 13b. On the outer surface of the left side wall 13d, when the wiring box 11 is fixed to a column 31 as a building structure, a contact seat 17 is provided to contact the column 31. A plurality of holes 18 (three in the embodiment) are formed.

Next, the airtight box cover 20 (hereinafter simply referred to as “box cover 20”) will be described.
The box cover 20 includes a cover body 21 formed in a bottomed square box shape having an opening 20a on one surface. Specifically, the cover main body 21 is formed by a bottom portion 22 having a rectangular shape and four side walls 23a to 23d erected from the peripheral edge of the bottom portion 22, and is formed by the bottom portion 22 and the four side walls 23a to 23d. It has the accommodating part 24 formed in enclosure. In the following description, the short side walls opposed to each other in FIG. 1 are referred to as an upper side wall 23a and a lower side wall 23b, and the long side walls opposed to the left and right in FIG. The cover main body 21 is formed by press molding or vacuum molding a transparent and flexible synthetic resin such as a polypropylene sheet. And the plane in which each front-end | tip of the four side walls 23a-23d is located is made into the opening surface of the cover main body 21, and the opening part 20a is enclosed by the four side walls 23a-23d, and is opened to the opening surface. Further, two cable insertion portions 27 are formed on the upper side wall 23a and the lower side wall 23b. The cable insertion portion 27 is opened for the first time when the cable 28 (see FIG. 2) is inserted, and is closed when the cable 28 is not inserted.

  Each of the four side walls 23a to 23d is formed so as to widen the opening width in the long side direction and the short side direction of the cover body 21 from the bottom part 22 toward the opening part 20a, and the accommodating part 24 extends from the bottom part 22 to the opening part 20a. It is formed to spread as it goes.

  As shown in FIG. 2, the accommodating portion 24 is formed to have a size that allows the wiring box 11 to be accommodated in the accommodating portion 24 from the opening 20 a and covers the entire outer surface of the wiring box 11 accommodated in the accommodating portion 24. Yes. In the state where the wiring box 11 is housed in the housing portion 24, the housing portion 24 is sized so that the outer surface of the contact seat portion 17 on the right side wall 13 c and the left side wall 13 d of the wiring box 11 faces the side walls 23 c and 23 d. The size is set such that the movement of the wiring box 11 in the housing portion 24 in the left-right direction is restricted. The depth of the accommodating portion 24 is set so that the opening side of the wiring box 11 does not protrude from the opening surface of the cover main body 21 when the bottom wall 12 of the wiring box 11 is in contact with the bottom 22 of the cover main body 21. Has been.

  A transparent flange portion 26 having a square ring shape is integrally formed on the entire periphery of the opening edge of the opening portion 20a in the cover body 21. The flange portion 26 is formed so as to extend from the entire circumference of the opening edge of the opening portion 20 a toward the outside of the cover body 21, and the front surface of the flange portion 26 is located on the opening surface of the cover body 21. Yes. Since the flange portion 26 is integrally formed with the cover body 21 having flexibility, the flange portion 26 is formed so as to be tiltable toward the bottom portion 22 side or the side away from the bottom portion 22 with the base end as the center.

  Four double-sided tapes 29 having a belt shape as an airtight tape are attached to the front surface of the flange portion 26. Each double-sided tape 29 is formed black on both sides. Here, in the present embodiment, “black” means a color that can be generally determined to be a dark color, and includes a double-sided tape formed of black and transparent.

  The four double-sided tapes 29 have flanges 26 on the back surface that is one side of each double-sided tape 29 such that the long-side direction of the double-sided tape 29 extends along the long-side direction of each of the side walls 23 a to 23 d of the cover body 21. It is stuck on the front of. Further, the four double-sided tapes 29 are attached to the flange portion 26 so that the end portions overlap each other between the adjacent double-sided tapes 29. In the present embodiment, both end portions of the upper and lower double-sided tapes 29 are stuck on the upper and lower end portions of the left and right double-sided tapes 29. The front surface of the flange portion 26 is covered with the four double-sided tapes 29 over the entire circumference. Each double-sided tape 29 has a back surface attached to the front surface of the flange portion 26 and a release paper (not shown) attached to the other surface.

  As shown in FIGS. 3 and 4, the wall W on which the wiring box 11 is installed is constituted by a pillar 31 and a pair of wall members 32 that are erected on both front and rear surfaces of the pillar 31. Yes. A hollow portion 33 is formed between the pair of wall members 32, and a heat insulating member (not shown) such as a foamed polystyrene plate, glass wool, or a hard foamed urethane plate is provided in the hollow portion 33. Further, a transparent airtight sheet 34 such as a polyethylene film is provided in the hollow portion 33 on the indoor side of the heat insulating member so as to cover the heat insulating member.

Next, an installation method for the wall W of the wiring box 11 using the box cover 20 will be described.
First, in order to fix the box cover 20 in the state in which the wiring box 11 is accommodated to the column 31, as shown in FIG. 2, the left rear surface of the flange portion 26 is positioned on the front side of the column 31. Arrange as follows. Next, a fixing screw (not shown) is inserted into the screw hole 18 of the wiring box 11, and the fixing screw is forcibly screwed into the column 31 through the left side wall 23 d of the box cover 20. Then, the box cover 20 is fixed to the pillar 31 and the wiring box 11 is fixed to the pillar 31 in a state of being accommodated in the box cover 20.

  Next, the cable 28 is inserted into the box cover 20 through the cable insertion portion 27, and the cable 28 inserted into the box cover 20 is further inserted into the wiring box 11 through the cable insertion hole 15. Next, the release paper provided on the surface of the double-sided tape 29 is peeled off to expose the surface of the double-sided tape 29.

  Next, as shown in FIGS. 3 and 4, a transparent airtight sheet 34 such as a polyethylene film is provided on the indoor side from the heat insulating member and the box cover 20. In addition, the thickness of the cross section of the box cover 20, the double-sided tape 29, and the airtight sheet 34 shown in FIG. 4 is exaggerated for convenience of explanation. The airtight sheet 34 is fixed to a part of the column 31 by, for example, a tucker or the like.

  Next, the airtight sheet 34 is attached to the entire surface of the double-sided tape 29. By the way, as shown in a part of FIG. 3 in an enlarged manner, when the hermetic sheet 34 and the double-sided tape 29 are attached, bubbles 35 enter between the hermetic sheet 34 and the double-sided tape 29. Furthermore, a portion (hereinafter referred to as a flow passage 35 a) where air is circulated between the outside of the box cover 20 and the accommodating portion 24 may be formed between the airtight sheet 34 and the double-sided tape 29. is there. However, since the black double-sided tape 29 is provided in the background of the flow path 35 a, the flow path 35 a is white on the double-sided tape 29 when the sticking surface (surface) of the double-sided tape 29 to the airtight sheet 34 is visually confirmed. It floats up and the flow path 35a formed between the airtight sheet 34 and the double-sided tape 29 can be easily seen. And if the flow path 35a can be visually recognized, the flow path 35a will be erased by crushing with a finger etc., and the distribution | circulation of the air of the outside of the box cover 20 and the accommodating part 24 is interrupted | blocked reliably.

  After confirming that the flow path 35a between the double-sided tape 29 and the airtight sheet 34 is reliably blocked, the portion of the airtight sheet 34 that covers the opening 20a of the cover main body 21 is defined as the opening of the opening 20a. By cutting along the edge, the opening 20 a is opened toward the front side of the airtight sheet 34. Further, the other wall member 32 is erected on the front surface side of the box cover 20 so as to sandwich the column 31, so that the wall W is constructed and wired to the hollow portion 33 in the wall W as shown in FIG. A box 11 is installed. In the installed state of the wiring box 11, the space between the airtight sheet 34 and the box cover 20 is hermetically sealed by adhering the airtight sheet 34 and the double-sided tape 29.

In the above embodiment, the following effects can be obtained.
(1) The back surface of the double-sided tape 29 is attached to the front surface of the flange portion 26 over the entire circumference of the flange portion 26, and the surface of the double-sided tape 29 attached to the airtight sheet 34 is formed in black. Yes. Therefore, even if the flow path 35a is formed between the airtight sheet 34 and the double-sided tape 29, the flow path 35a rises on the black double-sided tape 29, and the presence or absence of the flow path 35a can be easily recognized. . Therefore, at the time of the operation | work which sticks the double-sided tape 29 and the airtight sheet | seat 34, the flow path 35a can be erased reliably and the flow path 35a can be interrupted | blocked reliably. As a result, the airtight sheet 34 and the box cover 20 are hermetically sealed, and deterioration of the airtightness due to the installation of the wiring box 11 can be prevented.

  (2) The flange portion 26 is formed transparent, and both surfaces of the double-sided tape 29 are black. Therefore, the state of attachment between the flange portion 26 to which the back surface of the double-sided tape 29 is attached and the double-sided tape 29 can be viewed through the flange portion 26 from the rear surface side of the flange portion 26. Therefore, the presence or absence of the flow passage 35a between the front surface of the flange portion 26 and the back surface of the double-sided tape 29 can be easily visually confirmed. Therefore, when the double-sided tape 29 is adhered to the flange portion 26 and provided integrally, the flow passage 35a can be reliably erased, and the flow passage 35a can be reliably blocked. As a result, the space between the double-sided tape 29 and the flange portion 26 can be hermetically sealed, and deterioration of hermeticity due to the installation of the wiring box 11 can be prevented.

  (3) The double-sided tape 29 is formed in black over the entire surface on both sides. Therefore, even if the flow path 35a is formed between the airtight sheet 34 and the double-sided tape 29, the double-sided tape 29 is compared with the case where the double-sided tape 29 is formed in white or light color (for example, light red or light yellow). Thus, the presence or absence of the flow passage 35a can be easily visually confirmed.

  (4) The box cover 20 is provided with the flange portion 26, and the double-sided tape 29 adhered to the flange portion 26 is adhered to the airtight sheet 34, thereby blocking communication between the outside of the box cover 20 and the accommodating portion 24. be able to. Therefore, in order to block communication between the outside of the box cover 20 and the accommodating portion 24, the wall material 32 may not be erected as in the case where the packing is sandwiched between the wall material 32 and the flange portion 26. Communication between the outside of the box cover 20 and the inside of the accommodating portion 24 can be blocked.

In addition, you may change the said embodiment as follows.
In embodiment, although the double-sided tape 29 was affixed previously on the front surface of the flange part 26, it is not restricted to this. For example, first, the box cover 20 in which the wiring box 11 is accommodated is fixed to the pillar 31 together with the wiring box 11 in a state where the double-sided tape 29 is not attached to the front surface of the flange portion 26, and And, it is pulled into the wiring box 11 through the cable insertion hole 15. Next, a transparent airtight sheet 34 such as a polyethylene film is covered so as to cover the opening side of the box cover 20 and the wiring box 11 and the heat insulating member. Furthermore, on the surface of the airtight sheet 34, the back surface of the double-sided tape 29 is stuck in a square annular shape so as to cover the entire circumference corresponding to the flange portion 26.

  And the accommodating part 24 is opened by cutting out the inner side where the double-sided tape 29 in the airtight sheet 34 was stuck along the edge of the double-sided tape 29. Here, the presence or absence of the flow path 35 a between the double-sided tape 29 and the airtight sheet 34 is visually recognized from the back side of the airtight sheet 34. Further, after blocking the flow passage 35 a between the double-sided tape 29 and the airtight sheet 34, the flange part 26 is tilted toward the side away from the bottom part 22 around the base end of the flange part 26, and the flange part 26 is moved from the airtight sheet 34. Also take out so that it is exposed to the front side. And the rear surface of the flange part 26 exposed to the front side rather than the airtight sheet | seat 34 and the surface of the double-sided tape 29 are stuck. Here, the presence or absence of the flow path 35 a between the rear surface of the flange portion 26 and the double-sided tape 29 is visually recognized through the front surface of the flange portion 26. After confirming that the flow path 35a between the rear surface of the flange portion 26 and the airtight sheet 34 is reliably blocked, the other wall material (not shown) is interposed so as to sandwich the column 31 as in the above embodiment. ) On the front side of the box cover 20 to construct the wall W.

  In the embodiment, the double-sided tape 29 is formed in black over the entire front and back surfaces, but is not limited thereto. For example, as shown in FIG. 5, the double-sided tape 29 is divided into a black region 29a and a transparent region 29b at the half of the length in the width direction (the direction of the arrow X shown in FIG. 5). Tape 29 may be used.

  In the embodiment, the four double-sided tapes 29 have both end portions of the upper and lower double-sided tapes 29 attached to the upper and lower end portions of the left and right double-sided tapes 29, but are not limited thereto. For example, as shown in FIG. 6A, one end 291 of the upper and lower double-sided tape 29 is attached on the other end 292 of the left and right double-sided tape 29 and the other end of the upper and lower double-sided tape 29. 293 may be attached below the one end 294 of the left and right double-sided tape 29. In this case, as shown in FIG. 6 (b), the release paper P provided on the surface of each double-sided tape 29 is peeled off from one end 291 of the upper and lower double-sided tape 29 and one end 294 of the left and right double-sided tape 29. The other end 293 of the upper and lower double-sided tapes 29 and the other end 292 of the left and right double-sided tapes 29 are pulled out from between the overlapping double-sided tapes 29. Therefore, the release paper P can be easily peeled off from the surface of the double-sided tape 29 as compared with the case where both ends of the upper and lower double-sided tape 29 are stuck on the upper and lower ends of the left and right double-sided tape 29. Can do.

  In the embodiment, the color of the double-sided tape 29 is not limited to black, but may be, for example, blue, green, purple, etc., which are cold colors, or red, yellow, etc., which are warm colors. Also good. These colors can be easily visually recognized between the hermetic sheet 34 and the double-sided tape 29 as a flow passage 35a that communicates between the outside of the box cover 20 and the accommodating portion 24 and through which air flows. More preferred are dark blue, dark green, dark purple, dark red, dark yellow and the like.

  In the embodiment, the double-sided tape 29 is formed with black on both front and back surfaces, but not limited to this, only the surface (other surface) of the double-sided tape 29 to which the airtight sheet 34 is attached is formed with black. Also good.

  In the embodiment, the cover body 21 and the flange part 26 are both formed transparently in the embodiment, but the present invention is not limited to this, and for example, only the flange part 26 may be formed transparently.

In the embodiment, the box cover 20 is formed to be transparent, but not limited to this, the entire box cover 20 may be formed to be translucent.
The flange portion 26 is not connected to the four double-sided tapes 29 to form a quadrangular ring, but may be integrally formed in advance in a quadrangular ring.

  In the embodiment, one wall member 32 of the pair of wall members 32 is erected at a position on the front side of the box cover 20 fixed to the column 31, and the box cover 20 and the wiring box 11 are mounted on the column 31. After fixing, the wall W may be constructed by standing the other wall member 32 on the rear surface side of the box cover 20.

  In the embodiment, the double-sided tape 29 is attached in advance to the front surface of the flange portion 26. However, the present invention is not limited thereto, and the double-sided tape 29 may be attached in advance to the rear surface of the flange portion 26. In this case, the box cover 20 is inserted from the bottom 22 side through the opening formed in the airtight sheet 34, and the double-sided tape 29 attached to the front surface of the airtight sheet 34 and the rear surface of the flange portion 26 is attached. To do. Here, the presence or absence of the flow path 35a between the double-sided tape 29 and the airtight sheet 34 is confirmed by tilting toward the side away from the bottom 22 with the base end of the flange portion 26 as the center. That is, the flange portion 26 is formed to be transparent or translucent, and if the surface of the double-sided tape 29 is black (colored), the double-sided tape 29 is pasted on either the front side or the rear side of the flange portion 26 in advance. Even so, it is possible to visually recognize the state of adhesion between the double-sided tape 29 and the airtight sheet 34.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) The airtight box cover according to claim 1 or 2, wherein the airtight tape is formed in black over the entire surface.

  (A) The airtight tape is visible between the airtight sheet and the airtight tape, and is formed with a flow path through which air flows between the outside of the cover body and the inside of the cover body. Therefore, the airtight box cover according to any one of claims 1 and 2 and the technical idea (a), wherein the box cover is formed in a color other than white.

  (C) The airtight tape is formed in a strip shape, and the airtight tape is attached to the flange portion one by one so that the long side direction of the airtight tape extends along the long side direction of each side wall forming the cover body. In each of the airtight tapes, the end portions of the adjacent airtight tapes overlap each other, and one end portion of the airtight tape is adhered to the other end portion of the adjacent airtight tape. The airtight box cover according to claim 1, claim 2, the technical idea (A), and the technical idea (A).

  (D) The flange portion is formed to be transparent or translucent, and both surfaces of the airtight tape are formed in a color other than white, and the state of adhesion between the flange portion and the airtight tape is visually recognized. A wiring box installation method using the airtight box cover according to claim 3.

  W ... Wall, 11 ... Wiring box, 20 ... Airtight box cover, 20a ... Opening, 21 ... Cover body, 26 ... Flange, 29 ... Double-sided tape as airtight tape, 31 ... Pillar as structure, 34 ... Airtight Sheet.

Claims (3)

An airtight box cover that accommodates a wiring box behind the wall of a building and is airtightly attached to a transparent or translucent airtight sheet provided on the wall,
A cover body formed in a bottomed box shape having an opening on one side and accommodating the wiring box from the opening;
An annular flange extending from the entire periphery of the opening edge of the opening toward the outside of the cover body,
The flange portion is provided with an airtight tape having one surface adhered to the entire circumference of the flange portion and the other surface adhered to the airtight sheet, and the other surface of the airtight tape is colored other than white. An airtight box cover, characterized by being formed.   2. The airtight box cover according to claim 1, wherein the flange portion is formed to be transparent or translucent, and one surface of the airtight tape is formed in a color other than white. A wiring box is installed using an airtight box cover that is hermetically adhered to a transparent or translucent airtight sheet provided on the back of the building, while accommodating the wiring box behind the wall of the building. And
The airtight box cover has an opening on one side and a cover body formed in a bottomed box shape capable of accommodating the wiring box from the opening, and the cover body from the entire periphery of the opening edge of the opening. An annular flange portion extending outward,
Fixing the airtight box cover to the building structure in a state where the wiring box is housed in the cover body;
After adhering the flange portion and the airtight sheet with an airtight tape,
Use of an airtight box cover, wherein the airtight sheet and the airtight tape are visually recognized by visually recognizing a sticking surface of the airtight sheet to the airtight sheet. How to install the wiring box.

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