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Ships within 48 hours · Estimated delivery Nov 9 - Nov 14
69% free area * 1308: 7/8" lattice opening
Maximum dimension 41w
Smoke Test and More Information on MA Series Diffusers
945 Series Engineering/Performance Data
Interlocking steel roll-formed blades
3 Hour Out Of Air Fire Door Grille 2663-48X14 Smoke-Fire Damper 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"
