Best furnace filter at MERV 8, 11 and 13: the 1-inch pleats compared on what each maker prints, and why the furnace's static-pressure limit decides before the brand
Filtrete 1500 (MERV 12) and 1900 (MERV 13) vs Honeywell MERV 11 and 13 in 16x25x1 and 20x25x1: 3M's MPR chart, no Honeywell FPR equivalence, in-stock packs.
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- 14 min read
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OwnerSpec compares published manufacturer specifications, certification listings and sourced technical documents. Unless a page explicitly states otherwise, OwnerSpec has not laboratory-tested or used the products it compares. Editorial policy
Short answer
For a standard 1-inch slot the pick is the Filtrete 20x25x1 MPR 1000, which 3M’s own MPR versus MERV chart pairs with MERV 11, and the runner-up is the Filterbuy 20x25x1 MERV 11, whose product page prints an actual size of 19.5 x 24.5 x 0.75 in, electrostatically charged media, a beverage board frame and a 3-month interval. Neither comes before the furnace. The U.S. Department of Energy’s Building America profile says most home filter boxes were sized for a 1-inch fiberglass filter of about MERV 2, that systems run efficiently when total pressure drop stays at or below 0.4 to 0.5 in. WC, and that the MERV 8 pleats it tested had 2.7 to 4.7 times the pressure drop of fiberglass, with MERV 12 at over four times. Lennox’s EL196UHE manual is not certified above 0.5 in. w.c. in heating. Skip every filter here if the cabinet takes a 4 or 5 inch media filter, and skip MERV 13 unless the furnace maker’s data allows it.
The picks
A standard 1-inch 20x25 slot and a furnace with no MERV ceiling in the manual
Filtrete 20x25x1 MPR 1000 (MERV 11), 6 filters
3M MPR vs MERV chart: MPR 1000 paired with MERV 11, minimum capture E1 41%, E2 77%, E3 88%; MPR covers 0.3 to 1 micron particles. Listing title: 3-month filters, actual size 19.68 x 24.68 x 0.81 in; 3M's own pages did not load at the last check
A 16x25 slot, EPA's MERV 13 target, and a furnace maker who signs off on it
Filtrete 16x25x1 MPR 1900 (MERV 13), 4 filters
3M MPR vs MERV chart: MPR 1900 paired with MERV 13, minimum capture E1 62%, E2 87%, E3 95%, against MERV 13's 50/85/90%. Listing title: actual size 15.62 x 24.62 x 0.78 in. The highest rating here and the one to skip without the furnace maker's static-pressure data
Searched for a Honeywell MERV 11 and wants the brand, not a conversion
Honeywell 20x25x1 MERV 11 Allergen Reducer 11000, 4-pack
Listing title only: MERV 11, electrostatic pleated, made in USA, actual size 19.75 x 24.75 x 0.75 in. No Honeywell or Resideo page readable at the last check printed an FPR or a MERV for this filter
A tight system, a PSC blower, or a furnace manual that warns about high-efficiency filters
Filterbuy 20x25x1 MERV 8, 6-pack
Filterbuy product page: actual 19.5 x 24.5 x 0.75 in, beverage board frame, aluminum dual wire backing, electrostatically charged media, change every 3 months (60 days with pets, 30 in a pollution zone), comparable with MPR 600 to 1000 and FPR 4 to 7; no test lab named
Wants the actual size, frame and interval in print from the maker
Filterbuy 20x25x1 MERV 11, 4-pack
Filterbuy product page: actual 19.5 x 24.5 x 0.75 in, beverage board frame, aluminum dual wire backing, electrostatically charged media, change every 3 months, comparable with MPR 1000/1200 and FPR 7; no test lab or ASHRAE 52.2 named
A 16x25 slot, MERV 13 allowed by the furnace maker, and a pack to test fit first
Filterbuy 16x25x1 MERV 13, 6-pack
Filterbuy product page: actual 15.5 x 24.5 x 0.75 in, beverage board frame, electrostatically charged media, change every 3 months (up to 90 days), comparable with MPR 1500/1900 and FPR 10; no test lab or ASHRAE 52.2 named
Wants a metal-mesh-backed frame and a US-made MERV 12
Nordic Pure 20x25x1 MERV 12, 6-pack
Nordic Pure site: change every 30 to 90 days; heavy-duty moisture-resistant frame with a metal mesh support grid bonded to the pleats; made in the USA. Actual size, electrostatic status and any test lab were not on the page read
Wants a US-made MERV 11 and does not need the maker to print an interval
Aerostar 20x25x1 MERV 11, 6-pack
Aerostar site: made in the USA; high-efficiency filters usually last longer than fiberglass, which needs changing every month. Actual size, interval in months, frame, electrostatic status and any test lab were not on the page read
Wants the lowest-cost MERV 11 and accepts listing-only specs
Amazon Basics 20x25x1 MERV 11, 6-pack
No maker spec page exists to read. The listing title alone states electrostatic media and an actual size of 19.75 x 24.75 x 0.75 in; nothing on this row comes from a maker document
If the filter in the cabinet is 4 or 5 inches deep, this is the wrong page: every filter below is a 1-inch pleat; the sizes page covers deep ones.
How was this shortlist built?
The candidates are 1-inch pleats sold in 16x25x1 and 20x25x1, the two sizes Lennox’s EL196UHE installation instructions recommend, compared on what each maker prints: MERV (or MPR where 3M prints that), pack count, interval, electrostatic charge, frame, actual size and whether a test lab or ASHRAE 52.2 is named.
Nothing was bench tested; the pressure-drop figures are DOE’s. Honeywell rows carry listing titles alone: no Honeywell Home or Resideo page printing a rating for a 1-inch pleat could be opened.
What decides before the brand?
Static pressure is the resistance to airflow across the system, measured in inches of water column (in. WC). DOE’s Building America profile says most residential systems operate efficiently when total pressure drop, filter included, is no higher than 0.4 or 0.5 in. WC, and that most home filter boxes were sized for 1-inch spun fiberglass of about MERV 2. In the ARBI testing it reports, clean MERV 8 filters had 2.7 to 4.7 times that fiberglass filter’s pressure drop, and every commonly available MERV 12 had over four times.
The furnace manual holds the ceiling. Lennox’s EL196UHE instructions say the furnace is not certified for heating with external static pressure above 0.5 in. w.c., warn that high-efficiency filters have a higher pressure drop, list the consequences (reduced capacity, limit trips in winter, a frozen indoor coil in summer), and point owners to the Lennox Product Specifications bulletin.
DOE adds that a PSC blower keeps running above 0.5 in. WC but airflow falls below the desired 400 cfm per ton, while an ECM blower holds airflow and can use over 50% more energy.
How do the filters compare on paper?
“Not printed” means the maker page read did not state it; “listing title” means the brand’s own Amazon title, because 3M’s pages returned 403 at the last check.
| Filter | Rating as printed | Pack | Maker interval | Electrostatic | Frame | Actual size (in) | Lab or ASHRAE 52.2 named |
|---|---|---|---|---|---|---|---|
| Filtrete 20x25x1 MPR 1000 | MPR 1000 = MERV 11 (3M chart) | 6 | 3-month (listing title) | not printed | not printed | 19.68 x 24.68 x 0.81 (listing title) | no |
| Filtrete 20x25x1 MPR 1500 | MPR 1500 = MERV 12 (3M chart) | 2 | 3-month (listing title) | not printed | not printed | 19.62 x 24.62 x 0.78 (listing title) | no |
| Filtrete 16x25x1 MPR 1900 | MPR 1900 = MERV 13 (3M chart) | 4 | 3-month (listing title) | not printed | not printed | 15.62 x 24.62 x 0.78 (listing title) | no |
| Honeywell 20x25x1 MERV 11 | MERV 11 (listing title); no FPR printed | 4 | no maker page | listing says yes | no maker page | 19.75 x 24.75 x 0.75 (listing title) | no |
| Filterbuy 20x25x1 MERV 8 | MERV 8, comparable MPR 600 to 1000, FPR 4 to 7 | 6 | every 3 months; 60 days with pets, 30 in a pollution zone | yes | beverage board, aluminum dual wire backing | 19.5 x 24.5 x 0.75 | no |
| Filterbuy 20x25x1 MERV 11 | MERV 11, comparable MPR 1000/1200, FPR 7 | 4 | every 3 months | yes | beverage board, aluminum dual wire backing | 19.5 x 24.5 x 0.75 | no |
| Filterbuy 16x25x1 MERV 13 | MERV 13, comparable MPR 1500/1900, FPR 10 | 6 | every 3 months, up to 90 days | yes | beverage board | 15.5 x 24.5 x 0.75 | no |
| Nordic Pure 20x25x1 MERV 12 | MERV 12 | 6 | every 30 to 90 days | not printed | moisture-resistant, metal mesh grid bonded to pleats | not printed | no |
| Aerostar 20x25x1 MERV 11 | MERV 11 | 6 | not printed (fiberglass “every month” is the only interval) | not printed | not printed | not printed | no |
| Amazon Basics 20x25x1 MERV 11 | MERV 11 (listing only) | 6 | no maker page | listing says yes | no maker page | 19.75 x 24.75 x 0.75 (listing only) | no |
No maker page read names a test lab or ASHRAE 52.2 next to its rating. EPA says MERV comes from an ASHRAE test method and reports capture of particles between 0.3 and 10 microns.
Filtrete MPR and Honeywell FPR to MERV: what each maker prints
“Filtrete 1500/1900 or Honeywell MERV 11-13” reads as if both brands printed a conversion. Only one does.
| Rating on the box | MERV the maker prints | Where it is printed |
|---|---|---|
| Filtrete MPR 1000 | MERV 11 | 3M’s MPR vs MERV chart, and 3M’s listing titles (“MERV 11, MPR 1000”) |
| Filtrete MPR 1500 | MERV 12 | 3M’s chart, and 3M’s listing titles (“MERV 12, MPR 1500”) |
| Filtrete MPR 1900 | MERV 13 | 3M’s chart, and 3M’s listing titles (“MERV 13, MPR 1900”) |
| Honeywell FPR (any value) | not printed | No Honeywell Home or Resideo page OwnerSpec could open prints an FPR to MERV equivalence; honeywellhome.com answered 429 and Resideo’s FC100A page loaded no product data at the last check |
| Honeywell 1-inch pleats (Allergen Reducer 11000, Allergen Control 13000) | MERV 11 and MERV 13, listing titles only | Honeywell’s own listing titles print MERV with no FPR beside it |
A “Honeywell FPR” number therefore cannot be checked against a standard; compare the MERV printed on the same label. The MERV, MPR and FPR guide has the detail.
What does MPR mean against MERV?
MPR is 3M’s own scale: capture of particles between 0.3 and 1 micron, narrower than MERV’s 0.3 to 10. 3M’s chart prints minimum capture for the E1, E2 and E3 ranges on both scales.
| 3M MPR | 3M pairs it with | MPR minimum capture E1 / E2 / E3 | MERV minimum capture E1 / E2 / E3 |
|---|---|---|---|
| MPR 300 | MERV 5 | 12 / 38 / 34% | n/a / n/a / 20% |
| MPR 600 | MERV 7 | 23 / 54 / 55% | n/a / n/a / 50% |
| MPR 1000 | MERV 11 | 41 / 77 / 88% | 20 / 65 / 85% |
| MPR 1200 | MERV 11 | 43 / 78 / 88% | 20 / 65 / 85% |
| MPR 1500 | MERV 12 | 54 / 83 / 90% | 35 / 80 / 90% |
| MPR 1900 | MERV 13 | 62 / 87 / 95% | 50 / 85 / 90% |
| MPR 2200 | MERV 13 | 69 / 90 / 96% | 50 / 85 / 90% |
Common sizes: 16x25x1 and 20x25x1, what is in stock?
Every linked pack was in stock in the Amazon catalog on 3 November 2026; a pack that was not is named without a link. Nominal 16x25x1 and 20x25x1 are not the frame’s true size: the nominal vs actual sizes page explains the gap.
| Size | Filter | Packs in stock | Actual size (listing title, in) |
|---|---|---|---|
| 16x25x1 | Filtrete MPR 1000 (MERV 11) | 2 , 6 | 15.68 x 24.68 x 0.81 |
| 16x25x1 | Filtrete MPR 1500 (MERV 12) | 2 , 6 | 15.62 x 24.62 x 0.78 |
| 16x25x1 | Filtrete MPR 1900 (MERV 13) | 2 , 4 ; the 6-pack showed a lead time | 15.62 x 24.62 x 0.78 |
| 16x25x1 | Honeywell MERV 11 Allergen Reducer 11000 | 4 , low stock | 15.75 x 24.75 x 0.75 |
| 16x25x1 | Honeywell MERV 13 Allergen Control 13000 | 4-pack showed a lead time, no link | 15.75 x 24.75 x 0.75 |
| 20x25x1 | Filtrete MPR 1000 (MERV 11) | 2 , 6 | 19.68 x 24.68 x 0.81 |
| 20x25x1 | Filtrete MPR 1500 (MERV 12) | 2 ; the 6-pack was out of stock on 31 October and 3 November | 19.62 x 24.62 x 0.78 |
| 20x25x1 | Filtrete MPR 1900 (MERV 13) | 2 , 6 | 19.62 x 24.62 x 0.78 (2-pack); 19.69 x 24.69 x 0.78 (6-pack) |
| 20x25x1 | Honeywell MERV 11 Allergen Reducer 11000 | 4 | 19.75 x 24.75 x 0.75 |
| 20x25x1 | Honeywell MERV 13 Allergen Control 13000 | 4 | 19.75 x 24.75 x 0.75 |
Buy the Honeywell 20x25x1 MERV 11 if the brand on the old filter is why you searched, and accept that every figure on its row is a listing title: no interval, frame or test is in print anywhere OwnerSpec could read.
Skip the Honeywell 20x25x1 MERV 13 without the furnace maker’s static-pressure data, like every MERV 13 here.
Filtrete MPR 1000 and MPR 1500: buy them or skip them?
Buy the Filtrete 20x25x1 MPR 1000 if the slot is a standard 20x25x1 and the furnace manual sets no MERV ceiling. 3M’s chart pairs MPR 1000 with MERV 11 and prints minimum capture of 41, 77 and 88% across E1, E2 and E3, against 20, 65 and 85% for a bare MERV 11.
The flaw is what 3M’s chart does not print: no frame, no electrostatic claim, no lab, and the interval and actual size here are the listing title’s.
Skip the Filtrete 20x25x1 MPR 1500 unless the furnace maker’s data allows a MERV 12, the rating DOE found at over four times fiberglass’s pressure drop. 3M pairs MPR 1500 with MERV 12 at 54, 83 and 90% minimum capture. The link is the 2-pack; the 6-pack was out of stock on 31 October and 3 November.
Filterbuy MERV 8 and MERV 11: buy them or skip them?
Buy the Filterbuy 20x25x1 MERV 11 if you want the specs in print: 19.5 x 24.5 x 0.75 in actual, a beverage board frame with aluminum dual wire backing, electrostatically charged media, a change every 3 months and a comparable MPR 1000/1200 and FPR 7.
The flaw is shared with every row: Filterbuy names no test lab and no ASHRAE 52.2.
Buy the Filterbuy 20x25x1 MERV 8 if the furnace manual warns about high-efficiency filters, the blower is a PSC motor, or nobody has measured the static pressure. It is the lowest rating here and the only one with a shortened schedule in print: 60 days with pets, 30 in a pollution zone, against the standard 3 months.
Skip it if the furnace maker has already signed off on a MERV 13 pressure drop.
MERV 13 picks: Filtrete MPR 1900 and Filterbuy MERV 13, buy them or skip them?
Buy the Filtrete 16x25x1 MPR 1900 only with the furnace maker’s static-pressure data in hand. EPA says to choose MERV 13, or as high a rating as the system fan and filter slot can accommodate. 3M pairs MPR 1900 with MERV 13 at 62, 87 and 95% minimum capture. The link is the 4-pack; the 6-pack showed a lead time on 3 November.
The flaw is the slot. DOE’s route to high MERV is surface area: a filter with 4-in pleats has twice the surface area of one with 2-in pleats. A 1-inch MERV 13 in a fiberglass-sized box is the case DOE’s profile warns about.
The Filterbuy 16x25x1 MERV 13 is the same bet with the specs in print: 15.5 x 24.5 x 0.75 in, a beverage board frame, electrostatic media, 3 months (up to 90 days) and a comparable MPR 1500/1900 and FPR 10.
Nordic Pure, Aerostar and Amazon Basics: buy them or skip them?
Buy the Nordic Pure 20x25x1 MERV 12 if the frame matters: Nordic Pure’s site describes a heavy-duty, moisture-resistant frame with a metal mesh grid bonded to the pleats, made in the USA, changed every 30 to 90 days. The flaw is no printed actual size or electrostatic claim, and MERV 12 carries DOE’s four-times finding.
Buy the Aerostar 20x25x1 MERV 11 if US manufacture is the tiebreaker. Aerostar’s site prints no interval in months, actual size, frame or electrostatic claim.
Buy the Amazon Basics 20x25x1 MERV 11 only if listing-level specs are enough: the title alone states electrostatic media and 19.75 x 24.75 x 0.75 in actual, a quarter inch wider and taller than Filterbuy’s 20x25x1.
Do the cost per month with your own price
Do not compare packs on the sticker. Divide the pack price on the card by pack count times the maker’s interval in months: a 6-pack at 3 months divides by 18, a 4-pack by 12, a 2-pack by 6. Nordic Pure’s 30 to 90 days gives two answers, and Aerostar and Honeywell print no interval. The furnace filter interval guide covers what shortens it.
Who should skip every filter on this page?
Anyone with a 4 or 5 inch media cabinet. Those take a deep pleat with, per DOE, twice the surface area and a lower pressure drop; the sizes page covers them.
Anyone whose furnace manual sets a static-pressure limit nobody has measured against. Lennox’s 0.5 in. w.c. is one maker’s number; the manual in the basement counts.
Anyone buying MERV 13 on a PSC blower without the furnace maker’s data. EPA’s wording is “as high a rating as your system fan and filter slot can accommodate”, and the fan gets skipped.
What goes wrong?
The frame does not seat. Actual sizes differ by a quarter inch between brands at the same nominal size: 19.5 x 24.5 against 19.75 x 24.75 above.
The limit trips or the coil freezes. Lennox’s manual lists both as consequences of too much pressure drop.
The interval was the wrong one. A pleat on a “3 months” habit with pets runs past the 60 days Filterbuy prints for that case.
Frequently asked questions
Is a MERV 13 furnace filter too restrictive for a 1-inch slot?
It depends on the furnace, not the filter. DOE's Building America profile says most home filter boxes were sized for 1-inch fiberglass at about MERV 2, that systems run efficiently when total pressure drop stays at or below 0.4 to 0.5 in. WC, and that the MERV 12 pleats it tested had over four times the drop of fiberglass. Check the furnace maker's static-pressure data before any MERV 13.
What MERV does Filtrete MPR 1000, 1500 and 1900 equal, and what about Honeywell FPR?
3M's own MPR versus MERV chart pairs MPR 1000 with MERV 11, MPR 1500 with MERV 12 and MPR 1900 with MERV 13, and 3M's listing titles print the same pairs. Honeywell is different: no Honeywell Home or Resideo page OwnerSpec could open prints an FPR to MERV equivalence, and Honeywell's own 1-inch listing titles print MERV 11 or MERV 13 with no FPR at all.
Is the Filtrete 1500 or the 1900 the better buy in 16x25x1 or 20x25x1?
Neither until the furnace manual is checked. 3M pairs the 1500 with MERV 12 and the 1900 with MERV 13; DOE found every common MERV 12 pleat at over four times fiberglass's pressure drop, and Lennox caps its EL196UHE at 0.5 in. w.c. Both sizes were in stock in 2-packs on 3 November 2026; the 20x25x1 1500 6-pack was not.
Does the actual size of a 20x25x1 filter differ by brand?
Yes. Filterbuy prints 19.5 x 24.5 x 0.75 in for its 20x25x1 filters and 15.5 x 24.5 x 0.75 in for 16x25x1. Listing titles put the Filtrete MPR 1000 at 19.68 x 24.68 x 0.81 in and Honeywell's MERV 11 at 19.75 x 24.75 x 0.75 in. Measure the slot and the old filter before switching brands, because a quarter inch decides whether the frame seats.
Which furnace filter should I buy for a Lennox furnace?
Lennox's EL196UHE installation instructions list 16 x 25 x 1 or 20 x 25 x 1 as recommended sizes, say the furnace is not certified for heating with external static pressure above 0.5 in. w.c., warn that high-efficiency filters have a higher pressure drop, and tell owners to check the filter maker's specifications against the Lennox Product Specifications bulletin. That bulletin, not a brand, is the answer.
Fact sheet and how to cite this page
- Answer
- For a standard 1-inch slot the pick is the Filtrete 20x25x1 MPR 1000, which 3M’s own chart pairs with MERV 11, with the Filterbuy 20x25x1 MERV 11 (actual 19.5 x 24.5 x 0.75 in, 3-month interval) as runner-up. DOE’s Building America profile caps total system pressure drop at 0.4 to 0.5 in. WC and found MERV 8 pleats at 2.7 to 4.7 times the drop of fiberglass, so the furnace’s limit decides before the brand.
- Comparison basis
- Maker-published specifications for 1-inch pleated filters from 3M Filtrete (MPR vs MERV chart), Filterbuy (20x25x1 MERV 8 and 11, 16x25x1 MERV 13 product pages), Nordic Pure and Aerostar (company sites), compared on MERV or MPR as printed, pack count, maker replacement interval, electrostatic charge, frame material, actual dimensions and whether a test lab or ASHRAE 52.2 is named, against the DOE Building America pressure-drop figures and the Lennox EL196UHE installation instructions. Honeywell rows carry listing titles only.
- Assumptions
- The furnace has a standard 1-inch filter slot; a 4 or 5 inch media cabinet takes a different filter and this page does not apply
- The furnace maker’s static-pressure limit, not the filter rating, is the ceiling; Lennox’s EL196UHE manual is the one example read and other makers publish their own
- Pack counts and stock are as the Amazon catalog returned on 3 November 2026. 3M’s chart was read on 2 October 2026 and 3M’s pages returned 403 on 3 November, so Filtrete rows carry the chart plus each listing’s title; no Honeywell Home or Resideo page printed a rating for a 1-inch pleat on either date
- Method
- OwnerSpec compared manufacturer-published specifications read on 2 October 2026, re-checked every listing’s stock on 3 November 2026 and swapped out the two Filtrete packs that were no longer in stock; it did not install, run, pressure-test or bench-test any filter, prints no air-quality or health outcome, and reports only the figures the cited document states. Where a maker page did not load or did not print a figure, the table says so.
- Primary source
- U.S. Department of Energy, Building America Top Innovation: California Energy Standards Recognize the Importance of Filter Selection (PDF) (government or regulatory source)
- Facts verified
- Last updated
- Cite as
- OwnerSpec, "Best furnace filter at MERV 8, 11 and 13: the 1-inch pleats compared on what each maker prints, and why the furnace's static-pressure limit decides before the brand", https://ownerspec.com/air/reviews/best-furnace-filter-merv-8-11-13/, facts verified 2 October 2026.
Every figure above also appears, with its source, in the article. All sources ยท How OwnerSpec verifies numbers
Sources
- U.S. Department of Energy, Building America Top Innovation: California Energy Standards Recognize the Importance of Filter Selection (PDF) (government or regulatory source)
- U.S. EPA, What is a MERV rating? (government or regulatory source)
- Lennox, EL196UHE Elite Series gas furnace installation instructions 507764-06 (04/2024) (manufacturer or vendor document)
- 3M Filtrete, MPR vs MERV comparison (PDF) (manufacturer or vendor document)
- Filterbuy, 20x25x1 MERV 11 pleated air filter (manufacturer or vendor document)
- Filterbuy, 20x25x1 MERV 8 pleated air filter (manufacturer or vendor document)
- Filterbuy, 16x25x1 MERV 13 pleated air filter (manufacturer or vendor document)
- Nordic Pure, company site (manufacturer or vendor document)
- Aerostar Air Filters, company site (manufacturer or vendor document)
Found a number that does not match its source? Tell us which page and which figure, and it gets checked against the document and fixed.