Design and Operation
Window fans are designed to fit into open windows, and often have expandable side panels to cover the entire window opening. Most units have either one large-sized fan, or two small-sized fans mounted side by side.
Most window fans have 2 or 3 speeds, and some are electrically reversible so that the user can switch between intake and exhaust modes.
Manufacturers have added features to their models over the years. Some fans contain thermostats which will turn the fan off if the temperature drops to a certain point, or adjustable grilles to direct the flow of air in a particular direction. Other fans offer sophisticated electronic features such as a remote control, automatic shut off timers, or dimmer-like variable speed motor controls.
Most window fans today are made of plastic. Many older fans, however, are made of metal and are more solid. The more powerful window fans can be used to circulate air throughout a house, acting as a whole house fan.
Read more about this topic: Window Fan
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—Henry David Thoreau (1817–1862)
“Human knowledge and human power meet in one; for where the cause is not known the effect cannot be produced. Nature to be commanded must be obeyed; and that which in contemplation is as the cause is in operation as the rule.”
—Francis Bacon (1560–1626)