Greenheck specializes in manufacturing competitively priced, quality engineered replacement and OEM coils. Every coil we build is leak tested with 450 PSIG of dry nitrogen to guarantee 100% quality assurance. And just to be sure you get the performance you expect, our coils are tested in accordance with AHRI Standand-410-2001. Coils are constructed with copper tubes in 5/8, 1/2 or 3/8 inch outside diameter (OD), aluminum or copper fins, and galvanized, stainless steel, or copper casings. Insulated coil sections, stainless steel drain pans, and protective coatings are also available.