... Poultry house, greenhouse, heat-supplying system inworkshop, and for drying material.Component: Body of furnace, air inlet, air outlet, furnace gate, ... rapid providing of clean hot air efficiently;2. Second burning technology is adopted in the course of burning and heat supplying. No black ... of burn-resistance, wide longevity, automatic and manual temperature control. 9RFL-20D Coal-fired Air Heater