Environmental In-Ceiling, Back Box and Lower Dome• Single Back Box for Hard Ceiling Applications• Requires 4.4-Inch Space Above Ceiling and 4.3 Inches Below• Includes Heater and Fan• Minimum Ceiling Thickness .5-Inch; Maximum 1.75 Inches• 5.9-Inch Acrylic Bubble• Quick Disconnect to Dome Drive• Meets NEMA Type 4X, IP66 Standards• Aluminium Construction