3 Hour Out Of Air Fire Door Grille 2663-20X18 Residential Registers & Grilles * 2502 - Square or

* 2502 - Square or rectangular spring actuated (6) for horizontal or vertical mount

Standard Features * Heavy guage cold roll steel (same as 350 series) * Ideal for return air in the toe space areas between kitchen cabinets

Fractional

601TFG Series Engineering/Performance Data

3 Hour Out Of Air Fire Door Grille 2663-20X18 Residential Registers & Grilles * 2502 - Square orh3. 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"