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(i) Electric Air Fans
These are devices that are fitted with rotary fan blades and operated using electricity. When the fan blades are set into rotation the fan sets the air inside a room into currents.
(ii) Air conditioner
This is a device that absorbs stale air from the inside of a room and replaces it with fresh cooled air from the outside of a room.
lemass answered the question on February 10, 2019 at 19:50
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