if you need large quantity up to 1000 cfm of air at low pressure [ range in few centimeters of water column] the only choice is to buy an an axial blower, here air flows parallel to the axis of the rotating drum or hub. It has two set of aerofoil blades one set being fixed on casing called "stator blades" and the other blade row being fixed on the rotating drum called rotor blades. It has several stages.

The enthalpy and pressure of air increases as it passes through the rotating blades. the velocity of air is increased by rotating the rotating blade rotor by an electric motor. When air enters divergent end of aerofoil blades pressure increases. Fixed blades guides the air to flow to the next stage of rotating blades.

The main reason for the use of aerofoil blades is that it reduces turbulence and boundary separation. The pressure ratio is 1.2 to 1.3 per stage and a maximum achievable pressure ratio is 10. Normally 4 to 16 stages is used to achieve required pressure.

The axial blowers are used at so many places like air conditioning plants, Gas turbines, Furnaces, burners to burn coal powder, gas burners, oil burners ETC. These blowers are used to blow air on heat sinks of the CPU unit of computers also.

Several companies are engaged in the manufacture of axial blowers. The production system being followed is mass production.