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Double Door storage/warehouse vents are rooftop venting systems for factories qand industrial buildings that automatically opens, releasing heat, smoke, and noxious fumes during a fire, as required by building code section 910. The Universal Series smoke vents may also be used in stage venting applications as required by IBC section 410. Babcock-Davis Universal Series double door and quad door vents are UL 793 listed and FM4430 approved. (Comes standard in red oxide, shown in custom color SteelScape Gray.)SpecificationsCover & Liner14 gauge galvanized steel cover is stiffened to withstand a live load of 40 psf 22 gauge galvanized steel liner Curb 14 gauge galvanized steel, 12" high curb, 3.5" mounting flange, 0.625" diameter mounting holes Latch Zinc-plated steel pyrolatch with 165F fusible link, exterior and interior manual pull handles, holds covers closed against a 90psf wind uplift Spring/Hinge Zinc-plated steel heavy duty tamper proof spring and hinge pack designed to automatically open vent against a 10psf snow load Insulation 1" rigid insulation in cover and at curb perimeter Finish Red oxide powder coat |