HERO-TECH HTCT Series Design FeaturesSuspension structure: Stainless steel structure, painted with epoxy-(coal)tar or Chlorosulfonated polyethylene after plated with zinc. Enclosure structure: Polyester glass steel, with light weight, high strength corrosion resistant, anti aging, long service life. Air duct: Kinetic energy recovery type, reasonable air distribution with high efficiency. Fan: Aerofoil epoxy-(coal)tar blade, features big air flow, high efficiency, low noise and corrosion resistance.