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57% free area * 1307: 13/16" lattice opening
Maintains horizontal airflow pattern
Type 316 stainless steel
Standard Features * Extruded aluminum (
904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 14" Duct Opening (front blades parallel to shortest dimension)
Backdraft Vertical Mount 3550-20X25 Smoke-Fire Damper 57% free area * 1307:h3. Standard Features * 3550 Vertical mount * 3560 Horizontal mount air up * 3570 Horizontal mount air down * 3580 Round sizes available 5" to 24" * All non motorized backdraft dampers * Dampers are opened by air pressure differential and closed by gravity * 16 gauge channel frame with 26 gauge galvanized blades * Out of airstream linkage * Blades are vee stiffened 26 gauge for strength and stability * Square steel pivot pins * Nylon bushings * Single
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US$ 1799500.00
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US$ 416000.00
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US$ 24.95
US$ 7599500.00
