The framing dimensions for Keystone 34 are 37 3/8" width, 35 3/4" height, and 14 3/8" minimum framing depth. For Keystone 36, the framing dimensions are 39 3/8" width, 37 3/4" height, and 17 7/8" minimum framing depth. For Keystone 42, the framing dimensions are 43 3/8" width, 37 3/4" height, and 17 7/8" minimum framing depth.