4" 3 Hour Vertical Mount Fire Door 2665-36 Specialty Products Standard Features * 2633 -

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

904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 18" Duct Opening(front blades parallel to shortest dimension)

w/ Steel Opposed Blade Damper

*Note: Ceramic fiber blade insulation is not UL required on dampers with free areas less than 80 square inches

4" 3 Hour Vertical Mount Fire Door 2665-36 Specialty Products Standard Features * 2633 -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"