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Nylon bushings for easy adjustment and quiet setting of blades running parallel to shortest dimension
Center margins are mounted on the backside of the grille for a streamlined continuous look
945 Series Submittal
1/2" spacing dual angular louvers for strength and maximum free area
3 Hour Out Of Air Fire Door Grille 2663-36X26 Accessories Nylon bushings for easy adjustmenth3. 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"
