Size page
20x20x1 air filter: actual size, MERV, and price
Printed size 20x20x1 — actual about 19.75 × 19.75 × 0.75 (varies by brand). Pick a pack below.
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Match & price
- Honeywell 20x20x1 Standard EfficiencyMERV 8 · Pack of 4$26.95$6.74 per filterPrice checked 17 OctBuy at Honeywell Store
- Honeywell 20x20x1 Standard EfficiencyMERV 8 · Pack of 12$71.95$6.00 per filterPrice checked 17 OctBuy at Honeywell Store
- Filtrete 20x20x1 MPR 1000 Allergen DefenseMERV 11 · Pack of 1Not verified 15 Sep 2026Sold by Walmart — no direct link yet
- Honeywell 20x20x1 High EfficiencyMERV 11 · Pack of 4$32.95$8.24 per filterPrice checked 17 OctBuy at Honeywell Store
- Honeywell 20x20x1 High EfficiencyMERV 11 · Pack of 12$93.95$7.83 per filterPrice checked 17 OctBuy at Honeywell Store
- Honeywell 20x20x1 Ultra EfficiencyMERV 13 · Pack of 4$60.95$15.24 per filterPrice checked 17 OctBuy at Honeywell Store
- Honeywell 20x20x1 Ultra EfficiencyMERV 13 · Pack of 12$170.95$14.25 per filterPrice checked 17 OctBuy at Honeywell Store
- Nordic Pure 20x20x1 pleated (official via Awin)MERV 13 · Pack of 24$233.99$9.75 per filterPrice checked 17 OctBuy at Nordic Pure
Full answer
A 20x20x1 is a one-inch-class square furnace or AC filter. Buy the printed size 20x20x1. The panel is smaller than 20 inches on each face — commonly 19.75 × 19.75 × 0.75 or 19.5 × 19.5 × 0.75, depending on the brand.
Full answer
MERV 13 SKUs only: 20x20x1 MERV 13.
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 |
|---|---|---|---|
| Honeywell 1-inch High/Ultra Efficiency (MERV 11 and 13) | 20x20x1 | 19.75 × 19.75 × 0.75 | Honeywell Store product specs |
| Amazon Basics 20x20x1 MERV 11 6-pack | 20x20x1 | 19.75 × 19.75 × 0.75 | Amazon product title / actual size field |
| Filtrete 20x20x1 (MERV 13 / MPR 1900 listing) | 20x20x1 | Title: 19.62 × 19.62 × 0.78; dimensions field also 19.69 × 19.69 × 0.78 | Amazon B005GZ8IG2 — two figures on the same listing; measure if the slot is tight |
| Nordic Pure 20x20x1 pleated | 20x20x1 | Approximately 19.5 × 19.5 × 0.75 (19½ × 19½ × ¾) | JB Tools listing for Nordic Pure 20x20x1M13-24 |
If you currently run Nordic Pure (~19.5 square) and switch to Honeywell (19.75 square), expect a snugger slide-in. 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 20x20x1 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 re-checked 27 Sep 2026
These 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 that day for ordinary pleated 20x20x1: about $6/filter at MERV 8 in a 12-pack, $8–$11 at MERV 11, $9–$15 at MERV 13, with singles costing more than multi-packs. Nordic Pure factory cart MERV 13 24-pack price was verified 15 Sep 2026 and re-checked 17 Oct 2026 on nordicpure.com (one-time purchase price; same dollars).
Where to buy (all stores)
Where to buy
- Honeywell Store Current 1-inch 20x20x1, actual 19.75 × 19.75 × 0.75. Example: MERV 11 12-pack.
- Walmart Filtrete 20x20x1 MPR 1000 / MERV 11 packs: Filtrete 6-pack listing.
- Amazon Search this size: 20x20x1 furnace filter.
- AirFilters.com Custom and stock 20x20x1 cuts: airfilters.com.
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 20x20x1 SKU.
Sources
Sources (accessed 30 Aug 2026)
- EPA MERV table: epa.gov/indoor-air-quality-iaq/what-merv-rating (updated 14 Jan 2026)
- Honeywell Store 20x20x1 MERV 8/11/13 pack pages (prices and 19.75×19.75×0.75)
- Walmart Filtrete MPR 1000 20x20x1 pack prices.
- Amazon Basics 20x20x1 actual size field; Filtrete Amazon B005GZ8IG2
- JB Tools Nordic Pure 20x20x1M13-24 (19.5×19.5×0.75, $210.59)