1500 series. Fits up to a 3-0x6-8 (36" wide x 80" tall) door slab. For 2x4 walls. 125 lb. max door weight. For doors 1" to 1-3/8" thick. The 1500PF Series Standard-Duty Pocket Door Frame is designed to carry heavy standard size doors (up to 125lbs each) in standard 2 x 4 timber or steel framed stud walls. The 1500PF frame kit is packaged for easy transport and fast installation for either single door or converging door applications. The 1500PF is a versatile frame and can be adapted for use in non standard wall thicknesses, block masonry walls and can be cut down to accept any smaller size door size.