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* 2534 - Square or rectangular spring actuated (6) for horizontal or vertical mount
Airfoil blades individually adjustable on 3/4" centers
Opposed Blade Damper standard on 4" widths
904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 14" Duct Opening(front blades parallel to shortest dimension)
2" 3 Hour Vertical Mount Fire Door 2561-24X20 Accessories * 2534 - Square orh3. 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 *
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