PadMatch / Every humidifier water panel and furnace filter size
- MERV rating
- MERV 13
- Captures
- everything MERV 11 does plus bacteria, smoke and fine PM2.5 particles down to about 0.3 microns, capturing over 90 percent of airborne particles
- Filtrete MPR equivalent
- Filtrete MPR 1900, 2200 and 2800 (Healthy Living / Ultimate tiers); the same filter often ships as MPR 1900 at one retailer and MPR 2200 at another
- Home Depot FPR equivalent
- Home Depot FPR 10
- Best for
- the choice where wildfire smoke, virus carriers or fine PM2.5 are a concern, provided the blower can handle the added resistance
What MERV 13 filters out and how it maps to Filtrete MPR and Home Depot FPR.
MERV 13 on the ASHRAE 52.2 scale captures everything MERV 11 does plus bacteria, smoke and fine PM2.5 particles down to about 0.3 microns, capturing over 90 percent of airborne particles.
In the two proprietary retail scales, MERV 13 lines up with Filtrete MPR 1900, 2200 and 2800 (Healthy Living / Ultimate tiers); the same filter often ships as MPR 1900 at one retailer and MPR 2200 at another and Home Depot FPR 10. The conversions are approximate because each scale tests differently, so treat them as bands, not exact equals.
It is the choice where wildfire smoke, virus carriers or fine PM2.5 are a concern, provided the blower can handle the added resistance. A higher MERV resists airflow more, so confirm the blower can pull through it before jumping several steps.
Find your model
Read the number stamped on the humidifier cabinet or printed on the old pad, then match it below. Confirm the frame size before buying a generic.
- MERV 8 furnace filterHome Depot FPR 5
- MERV 11 furnace filterHome Depot FPR 7
- 16 x 25 x 1 furnace filterthe common flat size in every MERV
Sources: Filterbuy MERV vs MPR vs FPR ratings guide · 3M Filtrete MERV vs MPR comparison (3M multimedia) · GreenBuildingAdvisor: understanding MERV, FPR and MPR filter ratings