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Standard collar diameter is the same as the diffuser size
904 - Double Deflection Adjustable Aluminum Blade Grille For a 34" x 18" Duct Opening (front blades parallel to shortest dimension)
Heavy duty steel honeycomb construction
375 Series Engineering/Performance Data
Opposed Blade Damper standard on 4" widths
Steel Blade Double Deflection Diffuser 933-16X8 Finish:Designer Color - Warm White Standard collar diameter is theStandard Features * Surface mount diffuser * Nylon bushings for easy adjustment and quiet setting of steel blades * Countersunk mounting holes for flush appearance with color matching Phillips posi drive screws * Double deflection diffuser * Front blades parallel to longest dimension * Back blades parallel to shortest dimension * All blades adjustable allowing 4 way flow adjustment * Soft White Options * 933 O with recessed screwdriver operated
