Lattice Return Air Grille 600-4X40 Step Down Ceiling Diffuser Heavy Duty ConstructionMRI CompatibleInsect Screen

Heavy Duty ConstructionMRI CompatibleInsect Screen

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

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

One piece steel frame

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Lattice Return Air Grille 600-4X40 Step Down Ceiling Diffuser Heavy Duty ConstructionMRI CompatibleInsect ScreenStandard 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