3 Hour Out Of Air Fire Door Grille 2663-48X48 Smoke-Fire Damper Double deflection transition box mount

Double deflection transition box mount spiral pipe grille

Countersunk mounting holes with color matching Philips Pozidriv screws

Holds up to 1" filter

Face set in an outer T-Bar filter grille frame

3 Hour Out Of Air Fire Door Grille 2663-48X48 Smoke-Fire Damper Double deflection transition box mounth3. 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"