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Ships within 48 hours · Estimated delivery Sep 4 - Sep 9
Heavy Duty Construction
Flush core and frame provides smooth surface
Stainless steel
4-way reversible door on square sizes
69% free area * 1308: 7/8" lattice opening
Backdraft Vertical Mount 3550-26X36 Specialty Products Heavy Duty Constructionh3. 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
