Chicago plenum rated (CCEA) new construction housing for use in insulated ceilings can be in direct contact with insulation. Air-tight construction provides energy savings by reducing the flow of air through the ceiling. Patented design allows for easy, tool-less removal of the driver. Input Voltage: 120/277V Wattage: 20W Dimming: Lutron Hi-lume Premier 0.1% EcoSystem with Soft-On, Fade-to-Black Ceiling Thickness: Up to 0.5in. Extension collar accessory for ceilings up to 2", ordered separately (NIO-4EXTC2) Compatible Trims: NIO-4PRTLA, NIO-4PRTLNDC, NIO-4RC, NIO-4RD, NIO-4RG, NIO-4RNB, NIO-4RNDC, NIO-4RPH, NIO-4RPHA, NIO-4RSL, NIO-4RSLA, NIO-4RTLA, NIO-4RTLNDC, NIO-4RW, NIO-4SC, NIO-4SD, NIO-4SDSQ, NIO-4SG, NIO-4SNB, NIO-4SNDC, NIO-4SNDSQ, NIO-4SW Listing: cULus Listed for Damp Locations (Wet locations when used with compatible trim)