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Ships within 48 hours · Estimated delivery Aug 10 - Aug 15
3-hour fire resistance rating
Smoke Test and More Information on MA Series Diffusers
For evaporative cooling or high-velocity exhaust applications
950 Series Engineering/Performance Data
904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 24" Duct Opening (front blades parallel to shortest dimension)
Volume Damper Low-Leak OBD 3000-0BDLL-36X20 Commercial 3-hour fire resistance ratingh3. 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.
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