P625X: RECESSED BACKBOXRecessed steel backbox (6. 25 in. square, 4 in. deep, . 090 cu. ft. volume) features side knockouts and an undercoating with sound deadener. Corner mounting tabs with 8 32 U clips for grille installation. Side slots for depth adjustment in uneven surfaces or to attach channel rails when installed in suspended tile ceilings. Made in the USA Accessories (Not included): SG 4: SCREW MOUNT GRILLE
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