The punkah (fan) was used in India about 500 BCE. It was a handheld fan made from bamboo strips or other plant fiber, that could be rotated or fanned to move air. During See more

Mechanical revolving blade fans are made in a wide range of designs. They are used on the floor, table, desk, or hung from the ceiling (ceiling fan), and can be built into a window, wall, roof, etc. Electronic systems generating significant heat such as computers See more

Standalone fans are usually powered by an electric motor, often attached directly to the motor's output, with no gears or belts. The motor is either hidden in the fan's center hub or extends behind it. For big industrial fans, three-phase asynchronous motors are … See more

• Media related to Fans (mechanical) at Wikimedia Commons See more

Fans may be installed in various ways, according to the application. They are often used in a free installation, without any housing of any … See more

Fans generate noise from the rapid flow of air around blades and obstacles causing vortexes, and from the motor. Fan noise is roughly proportional to the fifth power of fan speed; halving speed reduces noise by about 15 dB.
The perceived … See more

• Affinity laws – Relationships between equipment performance and power
• Air cooler – Device that cools air through the evaporation of water
• Air purifier – Device that removes contaminants from the air in a room See more