Industrial Ventilation Fan tells you that the unknown past

"Industrial Ventilation Fan" fan, blowpipe and bladder, the first for the forced draft fan and utensils are blowpipe. Ancient Egyptian pottery goldsmith had used the blowpipe with air nozzles, Incas sometimes 8 to 12 brass while blowing. "Industrial Ventilation Fan" Later, the invention made using animal skins blast bladder, cystic duct and divided at both ends by the operator manual air inlet. Use of this humble blower still some areas in recent times. Eighteenth dynasty of Egypt Luck Mill (Rekhmir, about 1450 BC) tomb murals have been painted with "Industrial Ventilation Fan" tank-like foot blower images. When the inlet, the operator with a rope hauled bladder, then depress the air blown into the furnace, each furnace blower equipped with four, two opposite operations.