Bilco Type S Roof Hatch - 36" x 30"Bilco Type S Roof Hatch 36" x 30" Bilco is the premier roof hatch manufacturer. You rarely find a project specification that does not list Bilco as an acceptable manufacturer. The Bilco Type S Roof Hatch is a standard 36" x 30" size. That means the opening of the roof hatch or inside dimension is 36" x 30". They type S can be manufactured in steel, aluminum, steel aluminum combo, or stainless steel construction. The most common is the Type S 20 roof
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