3 Hour Out Of Air Fire Door Grille 2663-48X48 Smoke-Fire Damper 425 Series Engineering/Performance Data

425 Series Engineering/Performance Data

1050 Series Submittal

Face set in an outer T-Bar filter grille frame

Double deflection transition box mount spiral pipe grille

Standard Features * 2633 - Square or rectangular out-of-airstream fire damper for vertical mount only

3 Hour Out Of Air Fire Door Grille 2663-48X48 Smoke-Fire Damper 425 Series Engineering/Performance Datah3. 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"