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375 Series Engineering/Performance Data
Front blades are parallel to the shortest dimension
904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 12" Duct Opening (front blades parallel to shortest dimension)
RD Series Submittal
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
Parallel Volume Damper Low Leak 3000PLL-36X20 Specialty Products 375 Series Engineering/Performance Datah3. Standard Features * 16 gauge galvanized channel frame * Parallel blades are cee 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. Options * 3000 PLL Low Leak Air Control
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