Lattice Return Air Grille 600-18X30 Step Down Ceiling Diffuser Non-standard size collar (available in

Non-standard size collar (available in 6" through 20")

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 24" Duct Opening (front blades parallel to shortest dimension)

904 - Double Deflection Adjustable Aluminum Blade Grille For a 22" x 18" Duct Opening (front blades parallel to shortest dimension)

Available in 6”–12” collar sizes

3 hour fire resistance rating

Lattice Return Air Grille 600-18X30 Step Down Ceiling Diffuser Non-standard size collar (available inStandard 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