Fire-classified floor boxes eliminate the need for spray-applied insulation

Metallic and nonmetallic floor boxes preserve the fire rating of a concrete slab without the need for spray-applied insulation. Wiremold fire-classified floor boxes are UL tested and shown not to impact a floor's fire rating. They eliminate uncertainty concerning the location and amount of insulation to be applied, and also increase installation efficiency.

Unlike conventional floor boxes, Wiremold fire-classified floor boxes have conduit stubs that extend downward, penetrating the steel decking into the space below. The stems of steel floor boxes contain intumescent firestop material that, when exposed to high temperatures, expands and effectively seals the penetration from flames and heat.

In addition, a pad made of insulating material is secured under the metal floor box to control heat propagation through the box into the space above. Because nonmetallic floor boxes do not conduct heat, intumescent material located within the box itself is sufficient to maintain the fire rating.

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