... pig house 3) Coal as fuel Name:9RFL-20D Air HeaterScope: Used in livestock and Poultry house, greenhouse ... drying material.Component: Body of furnace, air inlet, air outlet, furnace gate, ventilator, air blower, chimney.Features:1. It ... has the advantages of rapid providing of clean hot air efficiently;2. Second burning technology is adopted in ... manual temperature control. 9RFL-20D Coal-fired Air Heater