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36" whole house fan is appropriate for homes with attics over 3200 sq
The mounting hardware includes sawtooth hangers and/or d-rings for frames that do not come with hardware
It includes a lock bolt that is key activated from both inside and outside
Internal dimensions: 3-1/2 In
*Service call includes 1 hours of labor
National 4 In. Square Zinc Plated Steel Broad Door Hinge Quick Roof 36" whole house fan isNational catalog model No. V504 thru V504BC series. The removable pin broad hinge is designed for general utility and industrial applications. Hinges are swaged for mortise installations. Loose pin allows doors to be removed without taking off hinges. Galvanized made of steel with brass pin.