NW2000CE 4 Inch Non-IC Shallow New Construction Housing is a thermally protected housing suitable for non-insulated new construction installations. Non-IC designation requires that insulation be kept a minimum of 3 inches away from housing. Below ceiling accessible. Takes up to 7/8 inch ceiling thickness. Low voltage 12 volt electronic transformer included. One 42 watt maximum, 12 volt GU5.3 MR16 bulb is required, but not included. Dimmable with a low voltage electronic dimmer. See attached dimmer compatibility reference when using LED bulb option. Suitable for damp locations. UL listed. 4.25 inch ceiling cut out. 12 inch length x 7.5 inch width x 3.5 inch height. A complete fixture includes a housing and trim, sold separately.