Lifting Cap: 15.3 Cu. Ft., 200 lbs./Load Platform ID: 20.75W x 44L x 39H Max Opening Req: 22.5 x46.5" 48" Tall
Lifting Cap: 35 Cu. Ft., 250 lbs./Load Platform ID: 28.75W x 56L x 52.5H Max Opening Req: 30.5 x 58.5" 60" Tall
For correct height, measure from Attic Floor to Garage Floor
Note: There are 4 springs in the legs of the carrier that stretch and keep ceiling cover tight allowing lift to auto stop flush with the attic floor. It's Amazing...