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904 - Double Deflection Adjustable Aluminum Blade Grille for a 48" x 18" Duct Opening (front blades parallel to shortest dimension)
375 Series Submittal
Low profile design for tight mechanical areas
Retainer cables are provided on sizes 12" and larger to allow the inner cones to hang securely while adjusting the diffuser
3-way register with stiffened 1/2" fan shaped louvers for silent operation
Backdraft Vertical Mount 3550-16X30 Specialty Products 904 - Double Deflection Adjustableh3. 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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