The H99RT is designed for remodelling applications in non-insulated ceilings. This is our most popular aperture size, it accepts a wide range of trim styles and finishes (lamps and trims sold separately). It also features an integral thermal protector to guard against misuse or improper lamping. This shallow housing is only 5-1/2 inches in height, allows for use in minimum 2 x 6 inch joist construction. The four pre-installed remodel clips easily secure the housing to any 1/2-5/8 inch thick hard ceiling material.