Omniguard total corrosion protection with proven tube and fin design;Foil-face insulation simplifies cleaning while preserving energy efficiency;A drain pan with one of the industry's lowest water retention rates reduces the chance of standing water, odors and allergens;Antimicrobial additive helps keep drain pans free of mold and mildew for cleaner, healthier air;10-year limited warranty on parts available for lasting peace of mind