Captures dust, pollen, and most allergens. Good middle ground between basic fiberglass and high-MERV filters that strain your HVAC system. ~$15 for a 2-pack. Pick the size that matches what's printed on your current filter (16x20x1, 20x25x1, etc.).
Buy on Amazon →HEPA + activated carbon. Replacement for the Coway AP-1512HH Mighty air purifier — one of the most common consumer air purifiers, especially in apartments. ~$30 for a full filter pack. Comes with both the HEPA filter and the carbon pre-filter.
Buy on Amazon →The most common fridge water filter — fits Whirlpool, Maytag, KitchenAid, and JennAir side-by-side fridges that take the EDR1RXD1 / Filter 1 cartridge. Certified to reduce lead, chlorine taste, and most common contaminants. ~$50 for a single cartridge.
Buy on Amazon →Why filters age out fast
Filter lifespan is rated against the cleanest possible air — light residential use in a low-pollution environment. Add a pet, a smoker, wildfire smoke, a baby crawling on the floor, or a household that opens the windows in pollen season, and the cadence shortens. Manufacturer-recommended timing is the floor, not the ceiling. If you can see grey on a white filter, it's been due for a while.
An easier way to remember
Marking your calendar works. But filters live on a quiet cycle that doesn't sync with any other rhythm in your life. Canary tracks all of these for you — you scan or add a filter once, set the cadence, and the app sends a quiet reminder when it's due. No alarm, no nagging.
For wildfire smoke season
Wildfire smoke is mostly PM2.5 — particles small enough to slip through standard filters. The two picks below upgrade an existing setup for active smoke events. The DIY box fan at the bottom is the CDC-cited setup for a single room on a budget. Coway AP-1512HH (already on this page) holds up well for smaller spaces; the picks below are for everything else.
MPR 1900 is roughly equivalent to MERV 13 — the lowest rating that meaningfully catches PM2.5. Compatible with most standard residential HVAC systems. Pick the size that matches what's printed on your current filter. ~$25 for a single 20x25x1 (the most common US size; verify yours before buying).
Buy on Amazon →Covers ~465 square feet. True HEPA + activated carbon. Four speed settings including a fast turbo for active smoke. Slightly louder than the Coway on high — worth it when air quality is genuinely bad. Replacement filters (HRF-R3 HEPA + HRF-AP1 carbon pre-filter) run about $45 combined. ~$230.
Buy on Amazon →The DIY box fan — CDC-cited setup
A 20-inch box fan with a 20x25x1 MERV 13 filter taped to the back performs nearly as well as a $400 commercial air purifier for a single room. About $40 total. The CDC published assembly guidance in 2024 confirming this — the link is below.
Tape the filter to the back of the fan so the arrow on the filter points into the fan. Run the fan on low or medium. That's the whole build.
No affiliate links here — just buy the box fan and the MERV 13 filter at your local hardware store.
Read the CDC's published guidance →Want Canary to track this for you?
Canary scans the products and appliances in your home, remembers what's in each one, and quietly reminds you when filters and supplies are due. Calm, no alarms, free to start.
Try Canary →Looking for more swaps? See everything we've recommended.
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