Volume Damper Low-Leak OBD 3000-0BDLL-30X22 Step Down Ceiling Diffuser Check Out The All About

Check Out The All About Spirals page

Standard Features * Full size fixed bar blade T-Bar lay-in return air grille *

904 Series Performance Data

Nylon bushings on adjustable blades prevent metal on metal rattle

Smoke Test and More Information on MA Series Diffusers

Volume Damper Low-Leak OBD 3000-0BDLL-30X22 Step Down Ceiling Diffuser Check Out The All Abouth3. 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.