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69% free area * 1308: 7/8" lattice opening
904 - Double Deflection Adjustable Aluminum Blade Grille For a 42" x 18" Duct Opening (front blades parallel to shortest dimension)
SD52 - Transition Box Spiral Pipe Grille (Single Deflection)
945 Series Submittal
Nylon bushings for easy adjustment and quiet setting of blades running parallel to shortest dimension
3 Hour Out Of Air Fire Door Grille 2663-36X26 Accessories 69% free area * 1308:h3. Standard Features * 2661 Square or rectangular fire door for vertical mount only. Maximum dimension 60x60. For damper free area chart A click here * 2663 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 60w x 52h. For damper free area chart B click here * 2665 Round fire door for vertical mount only. Available 4" thru 52" round. * 3 hour rated * UL and California State Fire Marshall approved * 4 1 4"
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