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Ceramic fiber blade insulation with fiberglass cover*
Heavy gauge cold roll steel
Locking screw to hold damper in place
055 T6 extruded aluminum * Five air patterns: 700 CB10 - one way
All steel parts with galvanized finish or zinc coating
3 Hour Out Of Air Fire Door Grille 2663-52X52 Commercial Ceramic fiber blade insulation withh3. 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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