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Blades parallel to shortest dimension
904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening (front blades parallel to shortest dimension)
Access door with 1-3/8" deep steel roll formed frame
Holds up to a 2" filter (not included) with filter retention tabs (FG2)
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 Blade Volume Damper 3000P-72X28 Smoke-Fire Damper Blades parallel to shortest dimensionh3. 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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