Our aluminum spiral pipe is formed from continuous coils of metal, using a 4 ply lockseam, with the strength for use on low, medium and high velocity air systems of either positive or negative pressure. Hercules manufactures spiral pipe in a variety of sizes, from 4" .040 all the way up to 40" .050. We produce this high quality pipe in both our Denver locations.  To best meet the specifications for this highly specialized product, Hercules will custom build it for you at your request. WE DO NOT CARRY ANY ALUMINUM SPIRAL PIPE IN STOCK. For more information and pricing, please call your local branch, or our Commercial Division at 1-800-870-4305, or 303-388-8999 in the Denver metro area.