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Nylon bushings on adjustable blades to prevent metal on metal rattle
Front blades are parallel to the shortest dimension
Low profile design for tight mechanical areas
120x120 multiple
855 Series Engineering/Performance Data
3 Hour Out Of Air Fire Door Grille 2563-12X12 Accessories Nylon bushings on adjustable bladesh3. Standard Features * 2561 Square or rectangular fire door for vertical mount only. Maximum dimension 48w, 49h. For damper free area chart A click here * 2563 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 48w, 41h. For damper free area chart B click here * 2565 Round fire door for vertical mount only. Available 4" thru 40" round. * UL and California State Fire Marshall approved * 2" thinline frame *
