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

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

Countersunk mounting holes with color matching Philips Pozidriv screws

Adjustable blades oriented for 3 or 4-way air flow pattern

Standard Features * Heavy duty honeycomb construction * Blades run parallel to longest dimension given * Gym Grade - includes welded core and extra supports for heavy duty application * Mounting holes for sidewall and ceiling application * Recessed screwdriver operated opposed blade damper to control air volume for positive balance of system * Soft White Options * No mounting holes * Tamper Proof Screws * Standard Color

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"