Juno Lighting Group IC21 Light, Galvanized Steel IC-rating allows housing to be completely covered with insulation Housing is vertically adjustable to accommodate up to a 1-Inch ceiling thickness and is thermally protected against the improper use of bulbs When used with Air-Loc gasket (ALG6, sold separately), stops the movement of air, in or out, reducing heating and cooling costs Shadow-free, knife-edge trim design blends smoothly in to the ceiling and allows architectural continuity with a wide variety of trims UL Listed, C-UL/CSA certified for damp and wet locations