heat exchanger parts installed bi metal thermostat (defrost thermostat) defrost heater you can send me your drawing heat ex 1)  Heating Media - Steam or Thermic Oil 2)  Material of construction - Mild Steel or Stainless Steel3)  Capacity of Fan connected to Oil Heater   a) Volume of Air Cubic Feet per Minute   b) Pressure of air in inch  4)  High temperature of heating media   5)  Available Space /  Size of oil Heater 6)  Connection of Oil Heater in size and place on Heater