How much clearance does my hot tub cover need for Airlift cover lifter?

The Airlift requires 9" clearance at the back of your hot tub as that is the space where your cover sits when lifted, and it also requires 4 - 5" clearance on each side for the mounting mechanisms. Also, when opened, this lifter holds your cover at the back of the tub upright so for its "headspace" you need at least 44.5" clearance from the top of your hot tub - you need this anyways to get in and out of your hot tub comfortably