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Retainer cables are provided on sizes 12" and larger to allow the inner cones to hang securely while adjusting the diffuser
Steel riveted and metal formed assembly
Recessed screwdriver operated Opposed Blade Damper
904 - Double Deflection Adjustable Aluminum Blade Grille For a 22" x 18" Duct Opening (front blades parallel to shortest dimension)
Holds up to a 2" filter (not included) with filter retention tabs (FG2)
Pressure Relief HD 3530-12X20 Specialty Products Retainer cables are provided onh3. Standard Features * 3510 Vertical mount * 3520 Horizontal mount air up * 3530 Horizontal mount air down * Designed to open with negative or positive pressures for intake or exhaust air * Felt edge blades to hold noise to a minimum * Aluminum construction * Blade to blade linkage * 1 4" pivot pins in nylon busings * Maximum size 24 x 24 * Mill finish h3. Options * Sleeve variations * Mounting flange * Adjustable counter balance to adjust various
