Firewall insert box
The invention described herein is a fire protection device in the form of an insert designed to be quickly installed in new or existing electrical boxes located in firewalls. This insert is comprised of a material designed to withstand high direct heat and serve as a barrier to the passage of direct heat or smoke and gases through firewalls rated under ASTM E-119. The insert features a flanged open end which overlaps any gaps between the existing electrical box and the wall. The back wall of the insert box may have either openings to permit wires to pass through to the electrical device or a plug-harness assembly which obviates the use of holes in the back of the insert box.
1. A fire protection device, comprising:
an insert box having at least one back wall, at least one flange, and at least one side wall extending from the at least one back wall to the at least one flange, the at least one side wall defining a cavity sized to accommodate at least one electrical device associated with an existing electrical box, wherein the at least one back wall has one or more openings sized to permit individual electrical leads to pass through the at least one back wall;
at least one locking tab disposed external to the cavity and extending from the at least one flange to the at least one side wall; and
a pad of intumescent material that is in communication with the at least one back wall and having a second set of one or more openings congruent with and corresponding to the one or more openings located in the at least one back wall,
wherein the insert box is adapted to fit within the existing electrical box such that the locking tabs engage a portion of the existing electrical box, and
wherein the at least one flange overlaps any gaps between the existing electrical box and a wall.
2. The fire protection device of claim 1 , wherein the at least one back wall contains a female wire harness plug connectable to a corresponding male wire harness located in the at least one electrical device.
3. The fire protection device of claim 2 , wherein the female wire harness plug is comprised of an intumescent material.
4. The fire protection device of claim 3 , wherein wire leads connected to the female wire harness plug are surrounded with intumescent plastic.
5. The fire protection device of claim 1 , wherein the insert box is comprised entirely of sheet metal.
6. The fire protection device of claim 1 , wherein the insert box is comprised entirely of intumescent plastic.
7. The fire protection device of claim 1 , wherein the insert box is comprised of a combination of sheet metal and intumescent plastic.
8. The fire protection device of claim 1 , wherein the at least one locking tab is integrally coupled to the insert box.
9. The fire protection device of claim 1 , wherein the at least one locking tab are affixed to the insert box.
10. The fire protection device of claim 1 , wherein the at least one locking tab comprises metal.
11. The fire protection device of claim 1 , wherein the at least one locking tab comprises plastic.
12. The fire protection device of claim 1 , wherein the at least one locking tab comprises serrations.
13. The fire protection device of claim 1 , wherein the at least one locking tab comprises three sides, the first side being coupled to the at least one side wall, the second side being coupled to the at least one flange, and the third side extending from the at least one flange to the at least one side wall.
14. The fire protection device of claim 13 , wherein a portion of the third side of the locking tab comprises serrations.
15. The fire protection device of claim 1 , wherein the insert box comprises four side walls.
16. The fire protection device of claim 15 , wherein the at least one locking tab comprises four locking tabs and one locking tab is coupled to each of the four side walls.