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Home ventilation in six steps: check outdoors first

Effective ventilation starts by checking outdoor air quality and weather, then using windows or mechanical exhaust appropriately.

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U.S. EPA

Original U.S. EPA guidance: Home ventilation in six steps: check outdoors first

Link card to original U.S. EPA guidance

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EPA advises against indiscriminate outdoor ventilation during high pollution, pollen, humidity or extreme temperatures. Windows and exhaust systems can complement each other.

Your try-it-at-home checklist

0 / 6 done

1. Before opening windows, check local outdoor pollution, pollen, humidity and temperature. Do not force outside-air ventilation during poor conditions.
2. When outdoor air is acceptable and it is safe, open a window or door for fresh air. Consider falls, security and rain.
3. When possible, create a cross-flow using openings on opposite sides. Avoid spreading pollutants toward shared corridors or other units.
4. Use bathroom and kitchen fans that actually exhaust outdoors, distinguishing them from recirculating equipment.
5. Maintain mechanical ventilation and replace filters according to its manual. A portable air cleaner does not fully replace fresh-air ventilation.
6. Reassess indoor moisture, odors and outdoor conditions. For gas leaks or dangerous smoke, follow evacuation and emergency directions rather than ordinary ventilation tips.

Original U.S. EPA guidance: Home ventilation in six steps: check outdoors first

Your try-it-at-home checklist

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