On insulated exterior ductwork jobs, contractors have told Polyguard that they reduce labor by about 20 percent by using Alumaguard instead of fabricated aluminum on the exterior surface. Plus, the company claims that contractors are giving their customer a superior weatherproofing system. Over 50 mils of sealant covering the entire exterior surface of the duct.
Polyguard Products, P.O. Box 755 Ennis, TX 75120-0755; (800) 541-4994; fax (972) 875-9425; www.polyguardproducts.com/products/Mechanical/datasheets/ALUMAGUARD%20DATA%20SHEET.pdf .