The use of vertical fans driven by engines was investigated in the 1950s.

These household appliances created suction by either a pumping action, bellows, a piston being pushed up and down a tube, or had a fan driven by the wheels.

But many record store owners, often ardent fans driven as much by passion as by profit, said the casualties are being felt at an emotional level.

The cooling system was of the free convection type assisted by a fan driven from a pulley mounted at the front end of the crank shaft.

Establishes ecodesign requirements for fans driven by motors with an electric input power between 125 Watts and 500 kilowatts.

It was designed to test full size aircraft and had six large fans driven by high powered electric motors.

At first fires were burned to create air currents and circulate air, but replaced by fans driven by steam engines.

It had a ventilation shaft, with a fan driven by a stationary bicycle.

It consists of eight large fans driven by four diesel engines, with a 5,000-gallon (19,000 litre) water tank to keep the engines cooled.

Although far from common, the single-shaft turbofan is probably the simplest configuration, comprising a fan and high pressure compressor driven by a single turbine unit, all on the same shaft.