35613 BTU, Air Defrost, PSC Motor Low Velocity Center Mount Evap Coil, 115V/60Hz/1Ph. Blue anti-corrosion-fin increases the life span of the coil. Air-pass guard is located at the bottom of the coil to improve heat exchange rate. Easy to replace defrost heater (LED model). Corrugated fin is used to increase heat exchange rate by expanding the surface area.