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855 Series Submittal
Back blades are parallel to the longest dimension
904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening (front blades parallel to shortest dimension)
For damper free area chart A click here * 2563 - Out-of-Airstream fire door
with 57% free area
3 Hour Out Of Air Fire Door Grille 2563-28X28 Residential Registers & Grilles 855 Series Submittalh3. 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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