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Why do you need a ventilation system?

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Ventilation provides a way for stale or contaminated air to leave a relatively enclosed space and for fresh, clean air to enter.

If you are doing something that releases hazardous materials into the air, ventilation is one way to clean them out and prevent their hurting people. Even if hazardous materials are not present, ventilation removes or dilutes odors associated with many people being in a closed space, making being there less annoying.
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