3 Hour Out Of Air Fire Door Grille 2663-36X24 Residential Registers & Grilles 3-way register with stiffened 1/2"

3-way register with stiffened 1/2" fan shaped louvers for silent operation

Lever Operated Opposed Blade Damper

and handle

Flush core and frame provides smooth surface

T-Bar Modular Core Diffuser with Round Collar 18-20

3 Hour Out Of Air Fire Door Grille 2663-36X24 Residential Registers & Grilles 3-way register with stiffened 1/2"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"