3 Hour Out Of Air Fire Door Grille 2663-36X22 Step Down Ceiling Diffuser 22 gauge butterfly style galvanized

22 gauge butterfly style galvanized steel blades

055 T6 extruded aluminum surface mount supply diffuser * Four air patterns: CB10 - one way

Spiral pipe diameter must be 4” larger than Height of the duct opening

All steel construction

14" * Soft White Options * Field installable Bowtie Damper (BD) * TVB - Thermal Vapor Blanket * HVD - Hinge Down Face

3 Hour Out Of Air Fire Door Grille 2663-36X22 Step Down Ceiling Diffuser 22 gauge butterfly style galvanizedh3. 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"