4" 3 Hour Vertical Mount Fire Door 2665-40 Specialty Products 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille for a 16" x 8" Duct Opening   (front blades parallel to shortest dimension)

Allows for 4-way airflow

Front blades are parallel to the shortest dimension

BD - field installable Bowtie Damper (available on even sizes 6"-14")

4" 3 Hour Vertical Mount Fire Door 2665-40 Specialty Products 904 - Double Deflection Adjustableh3. 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"