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22 gauge butterfly style galvanized steel blades
Countersunk mounting holes for flush appearance with stainless sheet metal screws
Opposed Blade Damper standard on 4" widths
Blade lock to secure blades once the product is activated
4 1/4" Vertical Mount Fire Damper 2633-10X8 past 12 months 22 gauge butterfly style galvanizedh3. Standard Features * 2633 Square or rectangular out of airstream fire damper for vertical mount only. * 2634 Square or rectangular Spring actuated (6) out of airstream fire damper for horizontal or vertical mount. * UL and California State Fire Marshall approved * 4 1 4" standard frame style * Maximum dimension 60w, 52h * Interlocking steel roll formed blade (3) with roll formed frames (1) * Blade lock (5) * Damper manufactured from corrosion
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