Eco Products, Inc.: Commercial HVAC ductwork and accessories.Fabri-Tech, Inc: Custom steel fabrication specialists. Carbon and stainless ductwork, chutes, hoppers, bins, launders, tanks, breeching, and plate work.Nystrom Building Products: Manufacture access panels, floor and roof hatches, louvers and expansion joint systems. Includes downloadable CAD drawings and CSI specifications.Pal International S.r.l.: Manufacture foam based pre-insulated ductwork . Product specifications, and completed installations .Perry Fiberglass Products Inc.: Manufacturer of fiberglass reinforced plastic duct systems for corrosive environments, pools, natatoriums, wwtp, chemical underground hvac.Truduct Products Limited: Stockists of ductwork and associated products. United Kingdom.USF Fabrication: Fabricate and supply access doors and hatches.