Rough Opening: 22 1/2" x 54" x 10'
Ceiling Hgt. Range (A): 105" - 120"
Landing Space (B): 73"
Projection (C): 79"
Step W x L x Facing: 3 3/8" x 12" x 3/4"
Side Rail W x D: 3" x 3/4"
Door Panel W x L x D: 20 3/4" x 52 1/4" x 1/4"