FilterBySize Furnace and AC filter sizes, actual dimensions, MERV

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24x24x1 air filter: actual size, MERV, and price

Printed size 24x24x1 — actual about 23.68 × 23.68 × 0.81 (varies by brand). Pick a pack below.

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Our pickNordic Pure 24x24x1 pleated (official via Awin)MERV 8 · Pack of 6$57.49$9.58 per filterLowest verified price per filter (MERV 8–11): $9.58 each, checked 16 OctBuy at Nordic Pure

Match & price

MERV 13 only? Compare the Nordic Pure MERV 13 2-, 3-, 4- and 6-packs on the 24x24x1 MERV 13 page.

Full answer

A 24x24x1 is a one-inch-class square furnace or AC filter. Buy the printed size 24x24x1. The panel is smaller than 24 inches on each face — Filtrete closer to 23.68 × 23.68 × 0.81 or 23.81 × 23.81 × 0.78, and Nordic Pure about 23.38 × 23.38 × 0.75. Do not substitute 20x20x1 — that is a different printed size.

Actual dimensions by brand

Actual size by brand

These numbers are copied from manufacturer or merchant product copy, not from a competitor size chart. Thickness is part of the fit: 1-inch racks take ~¾ inch media.

Brand Nominal Published actual (in.) Source
Filtrete 24x24x1 MPR 1000 / MERV 11 24x24x1 23.68 × 23.68 × 0.81 Amazon B07CQGMDV6 title and product-dimensions field “23.68 × 23.68 × 0.81”; B07FP5X2TF title “Actual Size 23.68 × 23.68 × 0.81 in”
Filtrete 24x24x1 MPR 1000 / MERV 11 (some listings) 24x24x1 Title: 23.69 × 23.69 × 0.81; 6-pack dimensions field also 23.81 × 23.81 × 0.81 Amazon B09YXYBJSY title “Actual Size 4-Pack 23.69×23.69×0.81 in”; B07FP5X2TF product-dimensions field lists 23.81 × 0.81 × 23.81 — two figures on the same family; measure if the slot is tight
Filtrete 24x24x1 MPR 700 / MERV 8 24x24x1 23.81 × 23.81 × 0.81 Amazon B0DMTH8H1F title “Actual Size 23.81 × 23.81 × 0.81 in”; product-dimensions field lists 23.81 × 23.81 × 0.81
Filtrete 24x24x1 MPR 1900 / MERV 13 24x24x1 23.81 × 23.81 × 0.78 Amazon Filtrete store 24x24x1 titles for MPR 1900 2-pack and 6-pack “Act Size 23.81×23.81×0.78 in”
Nordic Pure 24x24x1 pleated 24x24x1 Approximately 23.38 × 23.38 × 0.75 (23⅜ × 23⅜ × ¾) JB Tools listings for Nordic Pure 24x24x1M8-6 and 24x24x1M13-6

We did not find a Honeywell Store 24x24x1 1-inch SKU (MERV 8/11/13 4-pack or 12-pack) that publishes actual dimensions, so that brand is omitted rather than guessed. We did not find an Amazon Basics 24x24x1 listing that publishes an actual-size field, so that brand is omitted rather than guessed. If you currently run Nordic Pure (~23.38 square) and switch to Filtrete (~23.68 or 23.81 square), expect a snugger slide-in. Filtrete’s published actuals also disagree with each other by SKU. Measure the old filter if the slot is tight. Full method: how to measure.

MERV 8 vs 11 vs 13 (EPA facts)

MERV 8 vs 11 vs 13 (facts only)

MERV is ASHRAE 52.2, as summarized by EPA. Higher MERV captures a larger share of smaller particles. It also adds resistance. EPA says to pick at least MERV 13 or as high a rating as your system fan and filter slot can accommodate, and to ask an HVAC technician if you are unsure. A 1-inch MERV 13 is not HEPA. We do not claim health outcomes.

MERV EPA average capture efficiency (particle size) Typical 24x24x1 use
8 ≥20% of 1.0–3.0 µm; ≥70% of 3.0–10.0 µm Common pleated replacement when the manual does not call for higher
11 ≥20% of 0.30–1.0 µm; ≥65% of 1.0–3.0 µm; ≥85% of 3.0–10.0 µm Mid-grade 1-inch pleat (Filtrete MPR 1000 is commonly labeled MERV 11)
13 ≥50% of 0.30–1.0 µm; ≥85% of 1.0–3.0 µm; ≥90% of 3.0–10.0 µm Higher-efficiency 1-inch; confirm the furnace/air handler can take the extra pressure drop

Source: U.S. EPA, “What is a MERV rating?”, last updated 14 Jan 2026. Filtrete also prints an MPR number; MPR is 3M’s scale, not MERV. Compare MERV to MERV.

Where these prices came from

Pack prices checked 30 Aug 2026

The Nordic Pure card prices above are one-time purchase prices re-read on nordicpure.com on 16 Oct 2026 (unchanged from 6 Oct). The range and other-store notes below are public shelf/cart prices we recorded on 30 Aug 2026. They are not live. Shipping, subscribe-and-save, and store-only deals will move them. Per-filter math is pack price ÷ count, rounded to the cent.

Observed range on 30 Aug 2026 for ordinary pleated 24x24x1: about $8.62/filter at MERV 8 in a Nordic Pure 6-pack, $12.00 at MERV 13 in a Nordic Pure 6-pack, with 2-packs costing more per filter ($15.07 MERV 8; $17.10 MERV 13). Honeywell Store product URLs for 24x24x1 MERV 8/11/13 4-packs and 12-packs returned 404, so those rows are omitted rather than guessed. Walmart Filtrete product pages returned a bot check, so those pack prices are omitted rather than guessed. Amazon Filtrete pages were used for actual-size fields, not for this price table. Amazon Basics had no published 24x24x1 actual-size listing. Factory one-time purchase prices for the listed MERV 8 and MERV 13 2/6-packs were re-checked 12 Oct 2026 on nordicpure.com (every card matched; MERV and pack selected) (pick MERV and pack on the factory page). A 24x24x1 is not a 20x20x1.

Where to buy (all stores)

Where to buy

No ranking. Stock and price change. If the slot is an odd fraction that none of these actual sizes match, measure first — that is not a 24x24x1 SKU. A 20x20x1 is not a substitute.

Sources

Sources (accessed 30 Aug 2026)

  • EPA MERV table: epa.gov/indoor-air-quality-iaq/what-merv-rating (updated 14 Jan 2026)
  • Honeywell Store 24x24x1 MERV 8/11/13 4-pack and 12-pack product URLs returned 404; no published actual for this size
  • Amazon Filtrete B07CQGMDV6, B07FP5X2TF, B09YXYBJSY, and B0DMTH8H1F titles (actual-size fields). Filtrete store MPR 1900 24x24x1 titles 23.81×23.81×0.78. No Amazon Basics 24x24x1 actual-size listing found
  • JB Tools Nordic Pure 24x24x1M8-2 ($30.14), 24x24x1M8-6 ($51.74), 24x24x1M13-2 ($34.19), and 24x24x1M13-6 (23.38×23.38×0.75, $71.99)