For use in existing ceilings. Integral flange and exclusive locking bars permit quick mounting in 1/2 in to 1-1/2 in thick ceilings. UL & CUL listed for damp locations. IC/Non-IC peel away label for trims. When used with P8593-01 gasket kit, this housing is certified to meet ASTM E283 air tight requirements when installed properly per instructions.