Mines the extra wide x extra long 9F certified from Direct Lift, owned by Rotary Lift. Clear spans my 9' door. Ceiling is 10'3" and note it works perfect for stacking A and B's. Lift stops are 6" apart... so you're limited by that as well. As shown there is 3" above the Bee, so if you have a 10'6" ceiling you may sneak yours up one more latch.