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Ships within 48 hours · Estimated delivery Sep 11 - Sep 16
Available in 4" through 29" round
Steel construction
*Note: Ceramic fiber blade insulation is not UL required on dampers with free areas less than 80 square inches
Double deflection surface mount grille with adjustable airfoil blades
Square collar designed for a 20” × 20”
Backdraft Vertical Mount 3550-14X36 T-Bar Available in 4" through 29"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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