CA2057267C - Outlet box vapour seal - Google Patents
Outlet box vapour sealInfo
- Publication number
- CA2057267C CA2057267C CA 2057267 CA2057267A CA2057267C CA 2057267 C CA2057267 C CA 2057267C CA 2057267 CA2057267 CA 2057267 CA 2057267 A CA2057267 A CA 2057267A CA 2057267 C CA2057267 C CA 2057267C
- Authority
- CA
- Canada
- Prior art keywords
- box
- membrane
- outlet box
- cover plate
- edges
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Connector Housings Or Holding Contact Members (AREA)
Abstract
A resilient sealing membrane for an electrical outlet box is open with side and bottom walls. The side walls extend outwardly to be clamped by the cover plate against the drywall or snub over the outlet box edge to be clamped against the edge by the cover plate, The sealing membrane may be located inside or outside the outlet box and, whether inside or outside, may be a physically separate member or a coating on the outlet box.
Description
This invention relates to sealing membranes for use in combination with an outlet box to inhibit air flow through and about the box at the internal wall (usually drywall) between the habitable or usable area of the : house office or factory or the like; and the space between the drywall and the exterior wall.
An outlet box is the metal or plastic box which is usually mounted on a 2"x4" and which mounts a receptacle in the form of a socket, switch or the like for connection to the building electrical supply. A cover plate is attached to the receptacle or box to cover the opening of the box and cover the receptacle except for the receptacle interface, e.g. the toggle switchlfemale socket etc. The ^over plate extends outwardly beyond the box to contact the drywall about the outlet opening.
It is an object of the invention to provide a membrane impé-rvious to air flow having side and bottom walls and designed to be received inside the outlet box or to surround the outlet box to inhibit the flow of air therethrough or therearound. The membrane also tends to seal to electrical leads passing therethrough to prevent rlow of air through the lead apertures.
The membrane useful with the invention will be resilient and compressible, (in most cases it will be between 1/8" and 3/16"
thick), it will have to be fire resistant in most jurisdictions and should be non-toxic over the expected temperature range.
In one aspect of the invention the membrane is manufactured as a separate body for assembly to the inside of the box for use.
For such use, the membrane, although compressible and flexible, is formed to retain its own shape when unstressed. Such separately manufactured membrane is designed primarily for retrofitting in existing installatio~s although it may also be used in new instal-lations.
- 2o57267 The outlet box will (other than for the membrane), be of conventional construction with a number of optional 'punch-outs' or weakened areas for admission of the electrical leads at selected locations. A coated membrane layer will cover such optional punch-outs or weakened areas to be pierced at the selected location by the electrician. The membrane, after piercing, being resilient, will tend to seal to the electrical leads reducing air flow through the aperture.
(Regardless of the orientation of the box in use, the box wall facing the opening is called the 'bottom wall' and the surrounding box walls (whether the box is round, rectangular or of another shape) are referred to as side walls.) With the separately manufactured membrane, for use inside the box, it will be noted that this arrangement will be the most convenient for retrofitting. The separately extending membrane is provided with an outwardly extending flange extending over the outside edges of the box for clamping between the drywall and the receptacle cover plate; or with an outwardly, extending 'snub' over the outside edges of the box for clamping between the cover plate and such outside edges. What is called a 'snub' herein is a short extension of the membrane wall which is shaped to extend over the outside edges of the box wall and back along the box wall a short distance along the side wall of the box opposite to the main body of the membrane. Thus the portion of snub may be clamped, for sealing, between the outside edges of the box and the receptacle cover plate. An aperture must be made in the membrane to allow passage of the two live wires although the ground connection will usually be made between the bottom wall of the box and the bottom wall of the membrane.
The separately manufactured membrane for use outside the box can also be used for retrofitting although it will be noted that the box must be removed to allow installation of the membrane.
In such arrangement the membrane side walls are provided with an outwardly extending flange for clamping between the receptacle plate and the drywall. The outside membrane could also be provided with an inwardly extending snub for clamping between the receptacle plate and the outside edges of the box. With such an outside membrane the three-wire lead is led through an aperture in the membrane outside the box.
With the membrane coated on the inside of the box, the ground connection will extend through the membrane layer for connection to the ground lead. The membrane, coated on the inside of the box is coated over the outside edge and back along the outside of the box a short distance to form a snub. The snub material is clamped between the box edges and the receptacle plate.
Such coated membrane could be provided with an outwardly extending flange although this is likely to be uncommon. The electrical leads are led through an aperture in the coating corresponding to that in the box wall.
With the membrane coated on the outside of the box, arrangements are similar to those described in the preceding paragraph with two exceptions. Firstly the ground lead is exposed in this alternative. Secondly the outside coated membrane is snubbed over the outside edge of the box and a short distance inwardly along the box side walls so that the snub portion may be clamped between the edge and the plate.
i - 3 -X~.¢
Either coated membrane design will most commonly be used on new installations. With new installations there will usually be a vapor barrier of plastic film. For best sealing results the vapor barrier will be fastened over the snub, to be clamped between the snub and the receptacle plate.
In drawings whlch illustrate a preferred embodiment of the invention Figure 1 shows an embodiment with a physically separate membrane inside the box, Figure lA shows a perspective view of a membrane and outlet box before attachment, Figure 2 shows an alternate of the invention in Figure 1, Figure 2A shows a front view of the device of Figure 2 with a cover plate removed, Figure 3 shows an embodiment of the invention with a physically separate membrane outside of the box, Figure 4 shows an embodiment of the invention with a membrane coated on the inside of the box, Figure 5 shows an embodiment of the invention with a membrane coated on the outside of the box.
In Figure 1 and lA is shown a section of a conventional outlet box 10 mounted on a 2" X 4" (not shown) in association with an opening in drywall 12. The outlet box is provided with bottom wall 14 and side walls 16. The outlet box is formed with mounting tabs for attaching the receptacle and knock out or weakened areas 33 for insertion of the power leads.
(The front view of the outlet box in Figure 1 (and all figures) will be similar to that shown in Figure 2A although the ~' membrane is different in each of Figures 1,2,3,4,5.) A flexible resilient membrane 17 is shaped to provide side and bottom walls 18 and 20. The membrane side walls are dimensioned to lie alongside and inside the side walls of the box.
The membrane bottom wall is placed so that the ground connection 22 can be made between it and the bottom wall of the box. The outer extremities of the membrane side walls are formed into an integral flange 24 to over-lie the outside edges of the box and the drywall about the opening. The membrane 17 is separately manufactured and physically separate from the outlet box and such physically separate membrane is known as a 'boot'.
In installation, which typically will be a retrofit of a previous installation, the cover plate 30 and receptacle 26 (shown only as a lined outline with mounting tabs 32) are removed from the box. The ground connection is affected or left in place if previously made. An aperture is formed with any suitable implement in the 'boot' and the two power wires 28 passed there-through and the boot is then set in place. The power wires 28 are connected to the receptacle 26.
The receptacle 26 is not shown in detail but may assume many forms, e.g. a switch, female socket etc., and the receptacle is thus shown only as a rectangular outline and the connections of the power wires are not shown. The receptacle 26 is, however, provided with mounting tabs 32 which, as is conventional, are bolted to registering mounting tabs 36 on the outlet box. The installation bolts for attaching tabs 32 to tabs 36 will pass through the flange 24 of the membrane boot. The cover plate 30 is then bolted in place by its conventional attachment (not shown) to the receptacle. (Although unusual it is noted that the cover plate 30 could equally well be bolted to the outlet box.) However it is important to note that the thickness of the membrane is selected so that it is clamped between the lower side of the cover plate and the drywall 12, and also clamped between the lower side of the cover plate and the outlet box edges 19.
The membrane is preferably about 3/16~ thick and resiliently compressible, flexible and impervious to air flow.
It must be fire resistent and non-toxic over the range of expected temperatures. We prefer to use a membrane made from foamed polyurethane with closed cells.
Figure 2 shows a membrane similar to that in Figure 1, except that the Figure 1 flange is replaced with a snub 34 being an extent of the membrane material over the outside edges and back a short distance along the outside of the box walls. The snub 34 as shown in the front view, Figure 2A is formed to pass on each side of the box mounting tabs 36. The installation is the same as with the previous alternative.
The snub 34 of the membrane material is chosen to be sufficiently thick to be compressed between the lower surface of the cover plate 30 and the edges 19 of the outlet box. (Thus it is within the scope of the invention to form the boot with only a short flange extending outwardly over the box edges 19 for sealing, that is, without the return outward portion on the outside of the box.) However the 'snub' arrangement is preferred. If possible the drywall will be cut so that the return portion of the snub is, if possible, compressed by the near edges of the drywall.
X
-Figure 3 shows a membrane 37 dimensioned to fit about the outside of outlet box. An outwardly extending flange 38 is dimensioned permit clamping between the inside of the cover plate 30 and the outside of the drywall. The installation requires removal of the outlet box, passing the three wire lead 40 through an aperture formed in the membrane and re-installing the box. The receptacle 26 and cover plate 30 are then installed, the latter clamping the membrane to the drywall.
Figure 4 shows an otherwise conventional outlet box with a membrane layer 44 of about 3/16~ coated on the inside box walls and back on the outside a short distance to form snub 45. The techniques for providing such coating are well known. The ground mounting screw 42 must extend inwardly through the membrane for connection. The inside coated box is installed by bringing the three wire lead 40 through the box wall and a registering opening in the formed by the installer at a selected box opening for the purpose. With box, receptacle and cover plate 30 installed the snub 45 will be clamped between the cover plate and the box l9 edge customarily the membrane coating will not be applied over the tabs 36 so that tabs 32 contact or nearly contact tabs 36. In a new installation the vapor seal film 46 conventionally mounted rearwardly of the drywall is available to complete the seal. After the box is installed and before the cover plate the vapor seal film 46 is then led over the snubbed edges of the box to be clamped in place by the cover plate.
Figure 5 shows an otherwise conventional outlet box with a membrane layer 48 coated on the outside of the box and having a snub 5G extending over the box outside edges l9 to extend a short distance inwardly along the side wall. The ground screw is exposed for connection. The 1nstallation is the same as for the device of Figure 4 the three wire lead 40 passing through the membrane at a point aligned with the box opening selected by the installer. The cover plate 30 clamps the vapor seal film 46 and the snub 50 against the box edge 19 as in Figure 4.
With both alternatives of Figure 4 and 5 the snubs may be replaced by a shorter length of the membrane coating extending over the box edges only.
Thus the membrane in accord with the invention will seal against air flow between the cover plate and the outlet box front walls, and about the electrical leads passing through apertures formed in the membranes for that purpose. In some embodiments the membranes will seal between the cover plate and the front of the drywall and, depending on the skill in cutting the drywall between the outlet box and the edges of the drywall. It is true that in each case the seal will not be perfect. This does not alter the utility of the invention in reducing and inhibiting air flow through and about the outlet box located in the wall defining the habitable area of a building.
An outlet box is the metal or plastic box which is usually mounted on a 2"x4" and which mounts a receptacle in the form of a socket, switch or the like for connection to the building electrical supply. A cover plate is attached to the receptacle or box to cover the opening of the box and cover the receptacle except for the receptacle interface, e.g. the toggle switchlfemale socket etc. The ^over plate extends outwardly beyond the box to contact the drywall about the outlet opening.
It is an object of the invention to provide a membrane impé-rvious to air flow having side and bottom walls and designed to be received inside the outlet box or to surround the outlet box to inhibit the flow of air therethrough or therearound. The membrane also tends to seal to electrical leads passing therethrough to prevent rlow of air through the lead apertures.
The membrane useful with the invention will be resilient and compressible, (in most cases it will be between 1/8" and 3/16"
thick), it will have to be fire resistant in most jurisdictions and should be non-toxic over the expected temperature range.
In one aspect of the invention the membrane is manufactured as a separate body for assembly to the inside of the box for use.
For such use, the membrane, although compressible and flexible, is formed to retain its own shape when unstressed. Such separately manufactured membrane is designed primarily for retrofitting in existing installatio~s although it may also be used in new instal-lations.
- 2o57267 The outlet box will (other than for the membrane), be of conventional construction with a number of optional 'punch-outs' or weakened areas for admission of the electrical leads at selected locations. A coated membrane layer will cover such optional punch-outs or weakened areas to be pierced at the selected location by the electrician. The membrane, after piercing, being resilient, will tend to seal to the electrical leads reducing air flow through the aperture.
(Regardless of the orientation of the box in use, the box wall facing the opening is called the 'bottom wall' and the surrounding box walls (whether the box is round, rectangular or of another shape) are referred to as side walls.) With the separately manufactured membrane, for use inside the box, it will be noted that this arrangement will be the most convenient for retrofitting. The separately extending membrane is provided with an outwardly extending flange extending over the outside edges of the box for clamping between the drywall and the receptacle cover plate; or with an outwardly, extending 'snub' over the outside edges of the box for clamping between the cover plate and such outside edges. What is called a 'snub' herein is a short extension of the membrane wall which is shaped to extend over the outside edges of the box wall and back along the box wall a short distance along the side wall of the box opposite to the main body of the membrane. Thus the portion of snub may be clamped, for sealing, between the outside edges of the box and the receptacle cover plate. An aperture must be made in the membrane to allow passage of the two live wires although the ground connection will usually be made between the bottom wall of the box and the bottom wall of the membrane.
The separately manufactured membrane for use outside the box can also be used for retrofitting although it will be noted that the box must be removed to allow installation of the membrane.
In such arrangement the membrane side walls are provided with an outwardly extending flange for clamping between the receptacle plate and the drywall. The outside membrane could also be provided with an inwardly extending snub for clamping between the receptacle plate and the outside edges of the box. With such an outside membrane the three-wire lead is led through an aperture in the membrane outside the box.
With the membrane coated on the inside of the box, the ground connection will extend through the membrane layer for connection to the ground lead. The membrane, coated on the inside of the box is coated over the outside edge and back along the outside of the box a short distance to form a snub. The snub material is clamped between the box edges and the receptacle plate.
Such coated membrane could be provided with an outwardly extending flange although this is likely to be uncommon. The electrical leads are led through an aperture in the coating corresponding to that in the box wall.
With the membrane coated on the outside of the box, arrangements are similar to those described in the preceding paragraph with two exceptions. Firstly the ground lead is exposed in this alternative. Secondly the outside coated membrane is snubbed over the outside edge of the box and a short distance inwardly along the box side walls so that the snub portion may be clamped between the edge and the plate.
i - 3 -X~.¢
Either coated membrane design will most commonly be used on new installations. With new installations there will usually be a vapor barrier of plastic film. For best sealing results the vapor barrier will be fastened over the snub, to be clamped between the snub and the receptacle plate.
In drawings whlch illustrate a preferred embodiment of the invention Figure 1 shows an embodiment with a physically separate membrane inside the box, Figure lA shows a perspective view of a membrane and outlet box before attachment, Figure 2 shows an alternate of the invention in Figure 1, Figure 2A shows a front view of the device of Figure 2 with a cover plate removed, Figure 3 shows an embodiment of the invention with a physically separate membrane outside of the box, Figure 4 shows an embodiment of the invention with a membrane coated on the inside of the box, Figure 5 shows an embodiment of the invention with a membrane coated on the outside of the box.
In Figure 1 and lA is shown a section of a conventional outlet box 10 mounted on a 2" X 4" (not shown) in association with an opening in drywall 12. The outlet box is provided with bottom wall 14 and side walls 16. The outlet box is formed with mounting tabs for attaching the receptacle and knock out or weakened areas 33 for insertion of the power leads.
(The front view of the outlet box in Figure 1 (and all figures) will be similar to that shown in Figure 2A although the ~' membrane is different in each of Figures 1,2,3,4,5.) A flexible resilient membrane 17 is shaped to provide side and bottom walls 18 and 20. The membrane side walls are dimensioned to lie alongside and inside the side walls of the box.
The membrane bottom wall is placed so that the ground connection 22 can be made between it and the bottom wall of the box. The outer extremities of the membrane side walls are formed into an integral flange 24 to over-lie the outside edges of the box and the drywall about the opening. The membrane 17 is separately manufactured and physically separate from the outlet box and such physically separate membrane is known as a 'boot'.
In installation, which typically will be a retrofit of a previous installation, the cover plate 30 and receptacle 26 (shown only as a lined outline with mounting tabs 32) are removed from the box. The ground connection is affected or left in place if previously made. An aperture is formed with any suitable implement in the 'boot' and the two power wires 28 passed there-through and the boot is then set in place. The power wires 28 are connected to the receptacle 26.
The receptacle 26 is not shown in detail but may assume many forms, e.g. a switch, female socket etc., and the receptacle is thus shown only as a rectangular outline and the connections of the power wires are not shown. The receptacle 26 is, however, provided with mounting tabs 32 which, as is conventional, are bolted to registering mounting tabs 36 on the outlet box. The installation bolts for attaching tabs 32 to tabs 36 will pass through the flange 24 of the membrane boot. The cover plate 30 is then bolted in place by its conventional attachment (not shown) to the receptacle. (Although unusual it is noted that the cover plate 30 could equally well be bolted to the outlet box.) However it is important to note that the thickness of the membrane is selected so that it is clamped between the lower side of the cover plate and the drywall 12, and also clamped between the lower side of the cover plate and the outlet box edges 19.
The membrane is preferably about 3/16~ thick and resiliently compressible, flexible and impervious to air flow.
It must be fire resistent and non-toxic over the range of expected temperatures. We prefer to use a membrane made from foamed polyurethane with closed cells.
Figure 2 shows a membrane similar to that in Figure 1, except that the Figure 1 flange is replaced with a snub 34 being an extent of the membrane material over the outside edges and back a short distance along the outside of the box walls. The snub 34 as shown in the front view, Figure 2A is formed to pass on each side of the box mounting tabs 36. The installation is the same as with the previous alternative.
The snub 34 of the membrane material is chosen to be sufficiently thick to be compressed between the lower surface of the cover plate 30 and the edges 19 of the outlet box. (Thus it is within the scope of the invention to form the boot with only a short flange extending outwardly over the box edges 19 for sealing, that is, without the return outward portion on the outside of the box.) However the 'snub' arrangement is preferred. If possible the drywall will be cut so that the return portion of the snub is, if possible, compressed by the near edges of the drywall.
X
-Figure 3 shows a membrane 37 dimensioned to fit about the outside of outlet box. An outwardly extending flange 38 is dimensioned permit clamping between the inside of the cover plate 30 and the outside of the drywall. The installation requires removal of the outlet box, passing the three wire lead 40 through an aperture formed in the membrane and re-installing the box. The receptacle 26 and cover plate 30 are then installed, the latter clamping the membrane to the drywall.
Figure 4 shows an otherwise conventional outlet box with a membrane layer 44 of about 3/16~ coated on the inside box walls and back on the outside a short distance to form snub 45. The techniques for providing such coating are well known. The ground mounting screw 42 must extend inwardly through the membrane for connection. The inside coated box is installed by bringing the three wire lead 40 through the box wall and a registering opening in the formed by the installer at a selected box opening for the purpose. With box, receptacle and cover plate 30 installed the snub 45 will be clamped between the cover plate and the box l9 edge customarily the membrane coating will not be applied over the tabs 36 so that tabs 32 contact or nearly contact tabs 36. In a new installation the vapor seal film 46 conventionally mounted rearwardly of the drywall is available to complete the seal. After the box is installed and before the cover plate the vapor seal film 46 is then led over the snubbed edges of the box to be clamped in place by the cover plate.
Figure 5 shows an otherwise conventional outlet box with a membrane layer 48 coated on the outside of the box and having a snub 5G extending over the box outside edges l9 to extend a short distance inwardly along the side wall. The ground screw is exposed for connection. The 1nstallation is the same as for the device of Figure 4 the three wire lead 40 passing through the membrane at a point aligned with the box opening selected by the installer. The cover plate 30 clamps the vapor seal film 46 and the snub 50 against the box edge 19 as in Figure 4.
With both alternatives of Figure 4 and 5 the snubs may be replaced by a shorter length of the membrane coating extending over the box edges only.
Thus the membrane in accord with the invention will seal against air flow between the cover plate and the outlet box front walls, and about the electrical leads passing through apertures formed in the membranes for that purpose. In some embodiments the membranes will seal between the cover plate and the front of the drywall and, depending on the skill in cutting the drywall between the outlet box and the edges of the drywall. It is true that in each case the seal will not be perfect. This does not alter the utility of the invention in reducing and inhibiting air flow through and about the outlet box located in the wall defining the habitable area of a building.
Claims (15)
1. The combination of a sealing membrane and an electrical outlet box, and a cover plate, which electrical outlet box has side and bottom walls and outer edges on said outlet box side walls, said sealing membrane being formed of flexible, compressible, resilient, fire resistant and , at expected operating temperatures, non-toxic, material and having side and bottom walls, said sealing membrane having bottom and side walls being dimensioned and shaped to be placed inside and overlie the side and bottom walls of said box, an edge flange on said membrane adapted to extend outwardly from the outer extremity of said membrane side walls, over said outlet box side wall edges, and adapted to be clamped against said edges by an outlet box cover plate, wherein said edge flange is dimensioned to include a surrounding portion adapted to extend over drywall which surrounds an aperture for said box, said surrounding portion being of substantially uniform thickness sufficient to be clamped against said drywall by said outlet box cover plate.
2. The combination as claimed in claim 1 wherein said membrane is provided separately from said box.
3. The combination as claimed in claim 1 wherein said cover plate generally defines a flat plane and has a downwardly curved peripheral edge substantially uniform about its periphery, wherein said cover plate is dimensioned so that said peripheral edge may contact said drywall when installed, wherein said surrounding portion of said membrane is thick enough to be compressed against said drywall with said cover plate installed and thin enough to allow said cover plate edges to contact said drywall.
4. The combination as claimed in claim 2 wherein said cover plate generally defines a flat plane and has a downwardly curved peripheral edge substantially uniform about its periphery, wherein said cover plate is dimensioned so that said peripheral edge may contact said drywall when installed, wherein said surrounding portion of said membrane is thick enough to be compressed against said drywall with said cover plate installed and thin enough to allow said cover plate edges to contact said drywall.
5. A method of installing an outlet box, comprising :
providing an electrical outlet box, which electrical outlet box has side and bottom walls and outer edges on said outlet box side walls; and providing a sealing membrane, separate from said box, said sealing membrane being formed of flexible, compressible, resilient, fire resistant and at expected operating temperatures, non-toxic, material and having side and bottom walls, said sealing membrane being dimensioned and shaped to be placed inside and overlie the side and bottom walls of said box, an edge flange on said membrane adapted to extend outwardly from the outer extremity of said membrane side walls, over said outlet box side wall edges, and adapted to be clamped against said edges by an outlet cover plate, wherein said edge flange is dimensioned to include a surrounding portion adapted to extend over drywall which surrounds an aperture for said box, said surrounding portion being of substantially uniform thickness sufficient to be clamped against said drywall by an outlet box cover plate, forming an aperture in the membrane, passing power wires, through said aperture, installing the membrane in the outlet box, connecting the power wires to a receptacle, attaching the receptacle to the outlet box, and applying cover plate to seal the surrounding portion of said edge flange against drywall surrounding said box.
providing an electrical outlet box, which electrical outlet box has side and bottom walls and outer edges on said outlet box side walls; and providing a sealing membrane, separate from said box, said sealing membrane being formed of flexible, compressible, resilient, fire resistant and at expected operating temperatures, non-toxic, material and having side and bottom walls, said sealing membrane being dimensioned and shaped to be placed inside and overlie the side and bottom walls of said box, an edge flange on said membrane adapted to extend outwardly from the outer extremity of said membrane side walls, over said outlet box side wall edges, and adapted to be clamped against said edges by an outlet cover plate, wherein said edge flange is dimensioned to include a surrounding portion adapted to extend over drywall which surrounds an aperture for said box, said surrounding portion being of substantially uniform thickness sufficient to be clamped against said drywall by an outlet box cover plate, forming an aperture in the membrane, passing power wires, through said aperture, installing the membrane in the outlet box, connecting the power wires to a receptacle, attaching the receptacle to the outlet box, and applying cover plate to seal the surrounding portion of said edge flange against drywall surrounding said box.
6. The method as claimed in claim 5 wherein said cover plate has downturned peripheral edges outwardly of said surrounding portion, and said cover plate is applied to compress said surrounding portion until said peripheral edges contact said drywall.
7. A sealing membrane for use with an electrical outlet box, which electrical outlet box has side and bottom walls and outer edges on said outlet box side walls, said sealing membrane being formed of flexible, compressible, resilient, fire resistant and, at expected operating temperatures, non-toxic material and having side and bottom walls, said side walls defining an outer extremity, said sealing membrane being dimensioned and shaped to be placed inside and overlie the side and bottom walls of said box, an edge flange extending to an outer periphery on said membrane extending outwardly from the outer extremity of said membrane side walls, and adapted to extend over said outlet box side wall edges, to be clamped against said edges by an outlet box cover plate, wherein the outer periphery of said edge flange has a downwardly extending rim dimensioned to extend over the edges and then a short distance along the outer side of the box.
8. The sealing membrane as claimed in claim 7 wherein said membrane is provided separately from said box.
9. A membrane for use with an electrical outlet box, which outlet box has side and bottom walls and outer edges on said outlet box side walls, said sealing membrane being formed of flexible, compressible, resilient, fire resistant and, at expected temperatures, non-toxic, material and having side and bottom walls, and dimensioned and shaped to receive therein said outlet box, an edge flange on said membrane adapted to extend inwardly from the outer extremity of said side walls over said box side wall edges and to be clamped there against by an outlet box cover plate.
10. Membrane as claimed in claim 9 wherein said membrane is provided separately from said box.
11. In combination, an electrical outlet box having side and bottom walls and outer edges on said outlet box side walls, a flexible compressible resilient coating layer on the side and bottom walls, said layer being formed of material which is fire resistant and non-toxic at expected temperatures.
12. A combination as claimed in claim 11 wherein said coating is on the inside of said box.
13. A combination as claimed in claim 11 wherein said coating is on the outside of said box.
14. A combination as claimed in claim 12 wherein said layer extends over the outside edge of the box and is dimensioned to be clamped by a cover plate against said outside edge.
15. A combination as claimed in claim 13 wherein said layer extends over the inside edge of said box and is dimensioned to be clamped by a cover plate against said outside edge.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US62847190A | 1990-12-17 | 1990-12-17 | |
| US07/628,471 | 1990-12-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2057267A1 CA2057267A1 (en) | 1992-06-18 |
| CA2057267C true CA2057267C (en) | 1995-09-12 |
Family
ID=24519017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2057267 Expired - Fee Related CA2057267C (en) | 1990-12-17 | 1991-12-09 | Outlet box vapour seal |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2057267C (en) |
-
1991
- 1991-12-09 CA CA 2057267 patent/CA2057267C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2057267A1 (en) | 1992-06-18 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |