For the W series to maintain fire rating according to UL.
"Cylindrical type, Falcon W Series with 1/2 in. latch bolt throw. For use on single swinging type Classified steel-covered composite, hollow-metal doors rated up to 3 h; fiberglass, wood and plastic-covered composite doors rated up to 1-1/2 h; and wood-core doors rated 20 min for door sizes measuring up to 1219 mm (48 in.) wide by 2438 mm (96 in.) high."
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