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Ships within 48 hours · Estimated delivery Sep 24 - Sep 29
Standard collar diameter is the same as the diffuser size
Ceramic fiber blade installation with fiberglass cover*
w/ Steel Opposed Blade Damper
Concealed mounting holes with mounting screws
RS34 Series Submittal
Backdraft Vertical Mount 3550-20X36 Accessories Standard collar diameter is theh3. 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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