3 Hour Out Of Air Fire Door Grille 2663-26X26 T-Bar Note: Sizes listed are the

Note: Sizes listed are the duct or opening size the grille will fit into

Individually welded 14 guage diffusion bars

Hinged removable door with hinges parallel to the longest dimension

Available 4" thru 52" round

3 Hour Out Of Air Fire Door Grille 2663-26X26 T-Bar Note: Sizes listed are theh3. 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"