1. The fan of the central forced air furnace then circulates heat from the radiator through-out the building.

2. In operation, the apparatus uses heated air supplied by the forced air furnace to heat the heating fluid circulating through the apparatus.

3. 3,664 Brick drying machine products are offered for sale by suppliers on Alibaba.com, of which brick making machinery accounts for 8%, drying oven accounts for 1%, and hot air furnace accounts for 1%