Opposed Blade Volume Damper 3000-0BD-58X38 Smoke-Fire Damper 2x4 T-Bar (20" x 44"

2x4 T-Bar (20" x 44" duct)

Designed for return applications and as a vented access door to equipment

Building materials rated 2 hours or less

Square or rectangular ceiling radiation butterfly damper

904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 30" Duct Opening (front blades parallel to shortest dimension)

Opposed Blade Volume Damper 3000-0BD-58X38 Smoke-Fire Damper 2x4 T-Bar (20" x 44"h3. 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.