Product Overview: The product features high-temperature resistance measures, significantly extending its lifespan compared to conventional tube-type hot air furnaces. It incorporates longitudinal flue gas flushing of the heat exchanger fins and negative pressure exhaust, ensuring no dust accumulation and no need for cleaning, while maintaining stable thermal performance. It can be fueled by various types of coal or firewood and is equipped with a secondary air intake system for complete combustion. The technical and economic indicators of this furnace have all reached the leading level domestically.