Volume Damper Low-Leak OBD 3000-0BDLL-42X20 Residential Registers & Grilles Accessory to the 90 Series

Accessory to the 90 Series

904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 18" Duct Opening(front blades parallel to shortest dimension)

floors and partitions with fire resistance ratings of 2 hours or less (for ceiling application

Damper manufactured from corrosion tested galvanized mild steel (G-90)

Standard Features * Round 1-1/2 hour fire damper * Horizontal or Vertical installation * UL and California State Fire Marshall approved * Damper construction meets NFPA 90A requirements * Stainless steel curtain * 16 gauge steel frame * UL listed fusible link

Volume Damper Low-Leak OBD 3000-0BDLL-42X20 Residential Registers & Grilles Accessory to the 90 Seriesh3. 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.