A normal 200,000 calorie heat exchange gas hot air stove, if the temperature difference is in the range of 30 degrees, it can drive a room in the range of 5,000 cubic meters. If the temperature difference is about 20 degrees, it is about 6000 cubic meters. If the heat exchange type is 100,000 calories, Almost half of the range, the above driving needs to be in the case of circulating wind