Steel Blade Single Deflection Diffuser 931-20X16 Accessories inner dimension and outside dimension

inner dimension and outside dimension sizes available * Tamper proof screws * Standard Color

Long throw individually adjustable blades with 1 1/2" blades on 1 1/2" centers or 3" blades on 3" centers

Standard Features * T-Bar lay-in filter grille with steel removable perforated face * 3/16" holes on 1/4" staggered centers * 20" x 20" x 1" filter (not included) * Square collar for 20 x 20 duct * 2x2 galvaneal steel panel with seismic support holes * Soft White Options * Square to round No Labor Collar

Uniform 360 degree discharge pattern

904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 4" Duct Opening  (front blades parallel to shortest dimension)

Steel Blade Single Deflection Diffuser 931-20X16 Accessories inner dimension and outside dimensionStandard 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 * Single deflection diffuser with adjustable steel blades * Steel blades are parallel to longest dimension * Allows 2 way air deflection on one plane * Soft White Options * 931 O with recessed screwdriver operated opposed blade damper * 1331 and