Filtrete Room Air Purifier Replacement Filters

Every Filtrete filter we ship is 3M-manufactured and arrives in original 3M packaging — sealed cases, untampered, identical to what you'd get if you bought directly from Filtrete. We source through our authorized distribution channel, which means our supply chain is auditable end-to-end.

RememberTheFilter.com isn't a marketplace. We don't allow third-party sellers, and we don't list inventory we haven't verified. If you've had a bad experience with a Filtrete listing on Amazon or a marketplace site, that's specifically why we're built differently.

A few things go on with Amazon Filtrete pricing. Authorized 3M listings on Amazon are real, but third-party sellers in the same listing pool sometimes ship counterfeits, expired stock, or units that were repackaged after returns. The "buy box" rotates, so the seller you actually buy from isn't always the seller you think you're buying from.

When the price seems too low to be real, it usually isn't. Check the seller name at checkout, not the listing photo. Or skip the marketplace gamble entirely and buy from a specialty retailer that owns its supply chain.

Yes. Cases ship in the original 3M case packaging, with the original retail-pack inserts intact. We don't break cases to repackage as singles, we don't apply our own branding over 3M's, and we don't pull units from cases for "convenience packs." What 3M ships from the factory is what you get on your doorstep.

MPR stands for Microparticle Performance Rating — 3M's proprietary scale for the Filtrete line. It measures how well a filter captures particles between 0.3 and 1 micron (the smallest end of the airborne particle range). Higher MPR numbers capture finer particles.

3M uses MPR instead of MERV in marketing because MPR is more flattering to electrostatically-charged media in lab testing. Both ratings are real, both are useful, and the rating strip on this page maps MPR to its rough MERV equivalent so you can cross-reference with HVAC system specs.

MERV is the universal industry standard, published through ASHRAE 52.2 testing and used by HVAC professionals worldwide. MPR is 3M's proprietary scale for Filtrete. FPR (Filter Performance Rating) is Home Depot's proprietary rating for filters sold in their stores.

Rough cross-reference: Filtrete MPR 300 ≈ MERV 5, MPR 700 = MERV 8, MPR 1000 ≈ MERV 11, MPR 1500/1550 ≈ MERV 12, MPR 1900 ≈ MERV 13. FPR 5 ≈ MERV 8, FPR 7 ≈ MERV 11, FPR 10 ≈ MERV 13. Always check MERV for an apples-to-apples comparison across brands.

Higher MPR filters add static pressure to your HVAC system. Most modern furnaces and air handlers built after 2000 handle MPR 1000 (MERV 11) without issue, and many handle MPR 1500 (MERV 12) comfortably. MPR 1900 (MERV 13) is the step where airflow restriction becomes meaningful — older systems or tight 1″ slots may struggle.

Signs you've gone too high: weak vent airflow, blower running longer or louder, evaporator coil icing in summer, or higher utility bills. If any of those show up after switching, drop back one tier — e.g., MPR 1900 → MPR 1500 — or move to a 4″ deep-bed format which delivers high efficiency at lower restriction.

The size is printed on the edge of your current filter. Read the nominal size — for example, 16x25x1 — and order that size. Filtrete actual filter dimensions run about 1/4″ less than nominal on each side, which is industry-standard for proper slot fit.

If the printed size is worn off, measure the filter slot itself — not the old filter — and round up to the nearest standard size. Our How to Measure guide walks through it step by step.

Filtrete is sold in standard residential sizes only. If your slot is a non-standard size — common in older homes, commercial spaces, and some mid-century builds — Filtrete won't have it. We can usually get you the same MERV-equivalent performance through one of our other manufacturers in a custom size made to your exact slot dimensions.

Browse custom filters or request a quote with your slot dimensions and target MERV rating.

3M ships Filtrete to retailers in sealed factory cases — usually 4 filters per case for 1″ sizes, 2 filters per case for some 4″ and 5″ sizes. Selling them by the case keeps the original 3M packaging sealed all the way to your door, and it's how the math works out for the price you see on the page.

A year of filter changes for a typical home is roughly one case — so buying by the case usually means one purchase, not four. The case quantity for the size you've selected is shown on this page and enforced at checkout.

Standard Filtrete sizes ship within 1–2 business days from the warehouse closest to your delivery address. Most orders arrive in 2–5 business days via UPS or FedEx ground. Free shipping on orders $50+ in the lower 48 states.

Current production and shipping timelines are live on our production schedule page.

Yes. Filtrete ships on recurring delivery at a 10% discount on every order — cadences from every month through every 6 months, plus an annual option at 5% off. Pick the interval that matches your change-out schedule on the product page and we'll auto-ship.

Pause, skip, change cadence, swap the size, update the address, or cancel any time from your account dashboard. No emails required, no hold times, no cancellation fees.

Yes. Bulk and volume pricing on Filtrete is available for facilities, multifamily properties, fleets, and any organization ordering in standing rotation. We work with schools, clinics, property management companies, government agencies, and industrial facilities on recurring orders with negotiated pricing.

Request a quote with your specs and estimated annual volume, or visit our Commercial Services page.

Yes. We work with schools, government agencies, non-profits, and resale-exempt buyers regularly. Submit your certificate through our tax-exempt purchases page and we'll set up your account so future orders ship tax-free with no repeated paperwork. Purchase orders and government procurement are supported for established accounts.

Unopened Filtrete cases can be returned within 30 days under our refund policy. If a case arrives damaged or doesn't match what was ordered, submit a claim and we'll replace it — no back-and-forth. Sized incorrectly? Our Filter Fit Guarantee covers exchange to the right size.

Call 866-469-8556 Monday–Friday, 6 AM – 5 PM PST. Text 425-515-2727 anytime — we reply next business day. Email support@rememberthefilter.com for written support, including tax-exempt setup, bulk orders, and order status.

Full options live on our contact page.