What is WHI ?

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Drywall Slip-on Frame is an industry term describing a 3 sided frame designed to be installed on a wall composed of steel or wood studs with gypsum board or other facing material and is i...
ITS/WHI is "Warnoch Hersey". ITS/WHI is the formal designation for Intertek Testing Services / Warnock Hersey. ITS/WHI is an independent agency with testing, listing, in-plant inspection, and label...
ITS/WHI Fire Rated three (3) frames are available in the following maximum door opening sizes: F and FN-Series: 4' 0" X 10' 0" single door 8' 0" X 10' 0” double door or pairs MU-Series: ...
F-Series frames are available without returns: Fire Rated frames must have welded corners. Frames must include weled in wood or steel stud anchors. Installation requirements: Frames must be...
NO - Louvers are not approved for installation in a fire rated transom / side panel frames.  NFPA Pamphlet 80 - paragraph # 6.3.4.4 states “Louvers shall not be installed in either transom or s...