Opposed Blade Volume Damper 3000-0BD-42X30 Residential Registers & Grilles 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening  (front blades parallel to shortest dimension)

Double deflection transition box mount spiral pipe grille

Locking screw to hold damper in place

Designed to minimize vision into the air duct

Countersunk mounting holes for flush appearance with stainless sheet metal screws

Opposed Blade Volume Damper 3000-0BD-42X30 Residential Registers & Grilles 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.