Lattice Return Air Grille 600-4X40 Step Down Ceiling Diffuser 904 - Double Deflection Adjustable

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

Spiral pipe diameter must be 4” larger than Height of the duct opening

Five air patterns available

One piece steel frame

Fan shaped 1/2" spaced louvers

Lattice Return Air Grille 600-4X40 Step Down Ceiling Diffuser 904 - Double Deflection AdjustableStandard Features * 1 2" x 1 2" x 1 2" aluminum lattice return air grille * Surface mount grille with . 055 T6 extruded aluminum frame * 90% free area * Countersunk mounting holes for flush appearance with color matching Phillips posi drive screws * Soft White Options * 600 O opposed blade damper * No Labor Collar Square to round (square sizes only) * 600 T T Bar mount * 1 2" x 1 2" x 1" Lattice or 1" x 1" x 1" Lattice * Fractional sizes, inner