Original heating trade vintage catalog for SONOCO PRODUCTS COMPANY. Construction Products Division was located in Hartsville, SC. Manufacturers of Laminated Fibre Duct for slab-on-ground perimeter heating. Sonoco was known for using asbestos in felt wrap paper, although asbestos is not mentioned in this catalog. Sonoairduct recognized by builders and heating contractors as an improved, lower cost method of perimeter heating system installation. Specifically developed for use only as supply or return lines in loop, radial and lateral slab-on-ground systems using gas or oil fired furnaces and should be encased in concrete. Pictured is a home construction site in Atlanta ready for pouring of the slab. Edwards Ruffin Heating Service truck and Nordec Inc truck can also be seen in photos. Methods of installation are illustrated. Disbound from a large 1954 home builders heating catalog, this unique old four page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro heating equipment library. Pages are detached and may contain a small amount of residual glue on edge.