The SL236 provides Extended Travel with exceptionally smooth and quiet movement and is a great option for suspended ceilings in homes and corporate offices. - Must order SLB interface bracket separately; - Use Chief's MountFinder to determine which model number matches your specific projector; - Two internal outlets, one is switched on 110V units; - Fits most installation requirements, needing only 11" of clearance above the ceiling; - Easily accommodates multiple control options; - Extended Downward Travel up to 36" with 3 stopping positions; - UL Listed; - For fixed suspended installations; - For International Use, 220V.