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Ventilation provides fresh, outside air to building occupants and removes stale air, odors and moisture from the building.

Ventilation should be intentional, planned, and carefully constructed in a relatively simple system.

Many conventional homes are “ventilated” by air leaking into the home from attics, crawlspaces and basements–or by dirty, moist air outside leaky walls. These are sources of air, but not fresh air.

Fresh air should be deliberately taken from a source where the air is not contaminated, is then filtered, and is finally intentionally supplied to bedrooms and living rooms where it can flow to other rooms such as kitchens, bathrooms, and laundry rooms where it is exhausted—along with moisture and odors produced in those rooms.