Well, maybe it's not, I'm not sure, but I'm going to set it up next Tuesday. It's 800,000 BTUS. The people that installed it originally used B-Vent to chimney it up out of the steel building. It had a chimney fire and all the aluminum smelted down back into the heat exchanger. Oooopsie! I'll post some pics of this monster next week. It's made by Wood Master.