DIY Air Cleaner to Reduce Wildfire Smoke Indoors

Materials

20" X 20" air filter	20" X 20" box fan

Suggested rating: MERV 13 Only use certified fans

with UL or ETL marking
(2012 model or newer)

or

Clamps

Assembly

1.	Attach the air filter
to the back of the
box fan using either
clamps, duct tape or
bungee cords.

2.	Check the filter for
the direction of the
air flow (marked on
the side of the filter)

3.	Replace filters when
dirty.

Duct Tape Bungee Cords

Learn about box fan safety tips:

https://www.epa.gov/air-research/research-div-air-cleaners-reduce-wildfire-smoke-indoors#FAQ

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