Fig. 65. Stationary fan.
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134. The Construction of the Fan in Common Use. A motor turns the fan. There is a regulator on some fans, so that they can be run at different rates of speed. Oil cups are important parts of fans. When a new fan is purchased, these cups are full of oil. The oil will last for many months, but if an old fan heats and sparks while being run, have an electrician examine it to see if all the parts are in order and there is a supply of oil. Figs. 64, 65 and 66 show types of fans in common use.
Fig. 66. Movable electric fan.
Fig. 67. Stove ventilator.
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135. Ventilator. A hood (Fig. 67) with a pipe leading into the chimney, placed over a cook stove, will conduct hot air and steam up the chimney. This is due to the fact that warm air rises and cold air comes in to take its place. An open skylight over a cook stove, also, makes an excellent ventilator and cooling device for kitchens.