STRUCTURAL PLENUM CURBS Penthouse Plenum Curbs   MGM Products, Inc. specializes in the construction of “Penthouse Plenum Curbs”. These curbs are designed to typically support units exceeding 100,000 pounds. Most curbs will range from 24” to 60” tall. Custom CADD drawings and specifications are produced for Contractor pre-approval. Most curbs are produced with 2” X 2” X 1/8” structural Steel Tubing and a minimum 14 GA. galvanized steel. Curbs are generally shipped knock-down for assembly in the field. All hardware and instruction sheets are included. Options include: Sloped Curbs, Insulation, Access Doors, Internal Duct work, and Pipe Chases.    <back