Wildfire season · Infiltration defense

Smoke finds every gap.

Closing your windows cuts outdoor air by a third or more, but smoke still gets in through unintended openings, driven by differences in pressure and temperature. That's infiltration. These 15 checks close most of it.

0/ 15 sealed

Exposed

Where smoke gets in

Numbers match the checklist. Select one to jump to that check.

Seal the envelope

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Closed windows are not a closed house. These are the openings that get missed.↑ See on diagram

1
Close attic hatches
2
Close fresh air dampers
3
Close fireplace screens
4
Close every window and doorIncluding the garage-to-home entrance.
5
Seal large gapsAs much as possible, especially around doors.
6
Switch off exhaust fansKitchen, bathroom, clothes dryer and utility fans push air out, which pulls smoky air in to replace it.

Put your air system to work

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Once the house is closed up, filtration can keep the air clean inside.↑ See on diagram

7
Fit a MERV 13 or higher filterSeat and seal it properly. Air that slips around the filter never gets cleaned.
8
Set the furnace fan to run continuouslyConstant circulation means maximum particle removal through the central filter.
9
Run portable air cleaners on highHighest fan speed, in the rooms you actually occupy.
10
Confirm CO alarms work and haven't expiredWith less fresh air coming in, indoor pollutants build up faster.

Source control

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Smoke events last days. These lower exposure while you wait.

11
Avoid anything that adds smoke or fumes indoorsSmoking, wood stoves, candles, frying, non-HEPA vacuuming, and solvent-based paints or cleaners.
12
Stock several days of no-cook foodFrying and broiling add measurably to indoor particle levels.
13
Refill medicationsEspecially asthma and other respiratory medication.
14
Stay indoorsAvoid outdoor exercise while levels are high.
15
Air the house out when smoke clearsEven a temporary improvement is a chance to open windows and fresh air dampers and flush built-up indoor pollutants.

Real-Time Wildfire Smoke Detection

PM2.5

184

μg/m³

Poor

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