Air is drawn into the house through open windows, meaning that the air is unfiltered and may contain pollen or other allergens. This is in contrast to an air conditioner, which mainly circulates air through a heat exchanger.
The fan can also be noisy. The noise is due to the large volume of air handled by such a fan and the speed of the fan blades. Direct drive motors spin the blades faster, producing more noise compared to belt-driven fans, which allow lower fan speeds and less noise. The noise may interfere with other normal household activities such as listening to music, watching television, or conversation
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