Yes, a furnace fan can significantly help filter out wildfire smoke, provided it is used correctly and equipped with the right filtration.
To use your furnace fan effectively against smoke, follow these steps:
- Set the Fan to “ON”: Change your thermostat setting from “AUTO” to “ON.” This runs the blower fan continuously, ensuring that air is constantly circulated through the filter to capture airborne particles.
- Upgrade the Filter: Standard filters are often insufficient for smoke. Use a filter rated MERV 13 or higher, or a HEPA filtration system, as these are designed to trap the fine particulate matter found in wildfire smoke.
- Use Recirculation Mode: If your system has a recirculate setting or a manual fresh-air intake damper, close the intake and switch to recirculation. This prevents smoky outdoor air from being pulled into your ductwork and instead filters the air already inside your home.
For the best results, it is recommended to combine these fan adjustments with whole-home air cleaners or portable HEPA units to ensure maximum particle removal throughout the house.
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