Volume Damper Low-Leak OBD 3000-0BDLL-58X40 T-Bar 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 8" Duct Opening   (front blades parallel to shortest dimension)

One piece curved frame with gasket fits flush to spiral pipe

Standard Features * Gang-operated opposed blade radial volume control damper for use with RD Series Round Diffusers * Available in 2" increments from 6"-24"

Extruded aluminum frame with steel roll formed blades and steel multi-shutter damper

* 3 hour rated * UL and California State Fire Marshall approved * 4-1/4" standard frame style * Interlocking steel roll-formed blade (3) with roll-formed frames (1) * Blade lock (5) * Damper manufactured from corrosion tested galvanized mild steel (G-90) * Self locking corner (4) * 165° replaceable fusible link (2) h3

Volume Damper Low-Leak OBD 3000-0BDLL-58X40 T-Bar 904 - Double Deflection Adjustableh3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3.