4" 3 Hour Vertical Mount Fire Door 2661-48X30 Residential Registers & Grilles Hinged removable face with hinges

Hinged removable face with hinges parallel to longest side

listed Fire-Resistance Diffuser * 700 Series - T-Bar Lay-in Panel * TVB - Thermal Vapor Blanket * Square collar

Nylon bushings on adj

904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 18" Duct Opening (front blades parallel to shortest dimension)

904 - Double Deflection Adjustable Aluminum Blade Grille For a 14" x 10" Duct Opening (front blades parallel to shortest dimension)

4" 3 Hour Vertical Mount Fire Door 2661-48X30 Residential Registers & Grilles Hinged removable face with hingesh3. 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"