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16x25x4 air filter: actual size, MERV, and price

Printed size 16x25x4 — actual about 15.94 × 24.87 × 4.38 (varies by brand). Pick a pack below.

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Our pickNordic Pure 16x25x4 pleated (3-5/8 actual; official via Awin)MERV 8 · Pack of 6$119.99$20.00 per filterLowest verified price per filter (MERV 8–13): $20.00 each, checked 17 OctBuy at Nordic Pure

Match & price

AprilAire air purifier (1410, 2410, 4400…)? Those take the AprilAire 410 / 413 cartridge, not a generic 16x25x4 — see AprilAire 410 vs 413.

Full answer

A 16x25x4 is a four-inch media filter for a dedicated cabinet — Honeywell F100/F200 (FC100/FC200 replacements), Filtrete deep-pleat, and similar housings. It is not a 1-inch slot filter. Buy the printed size 16x25x4. The cartridge is smaller than that label, and actual depth varies more by brand than on 1-inch panels (about 3.6–4.4 inches is common). Measure the old cartridge before you order.

Full answer

Same panel, swapped axes: 25x16x4. We treat 16x25x4 as the canonical label. Order 16x25x4. Do not substitute a 16x25x1. Do not mix this up with a 16x25x5 SKU: some Honeywell 4-3/8-inch replacements are sold under a 16x25x5 label.

Sister OEM face in the same F100/F200 family: Honeywell FC100A1037 (20x25x4).

Actual dimensions by brand

Actual size by brand

These numbers are copied from manufacturer or merchant product copy, not from a competitor size chart. On 4-inch media, thickness is the fit: a 3.63-inch (3-5/8) “true 4-inch” pleat will not fill a Honeywell cabinet that takes 4-3/8.

Brand Nominal Published actual (in.) Source
Honeywell Home CF200A1008 (4-inch Ultra Efficiency, MERV 12; Honeywell Store, discontinued) 16x25x4 15.94 × 24.87 × 4.38 Honeywell Store product specs (“Actual Dimensions: 15.94 x 24.87 x 4.38 in.”); listed as a FC100A1029-class replacement
Honeywell Home CF100A1009 (4-inch High Efficiency, MERV 8; Honeywell Store, discontinued) 16x25x4 15.93 × 24.87 × 4.38 Honeywell Store product specs (“Actual Dimensions: 15.93 x 24.87 x 4.38 in.”)
Filtrete 16x25x4 MPR 1000 / MERV 11 and MPR 1550 / MERV 12 (typical deep-pleat packs) 16x25x4 15.88 × 24.56 × 4.31 Amazon titles and “exact dimensions” copy, B09RQCMR5V and B09RQBQ776; listed as fitting Lennox and Honeywell media cabinets. Fits systems calling for 4.31" and larger
Filtrete 16x25x4 MERV 13 / MPR 1900 (some SKUs) 16x25x4 15.44 × 24.62 × 4.31 Amazon product title on the MERV 13 2-pack (“Actual Size 15.44 x 24.62 x 4.31 in”)
Filtrete 16x25x4 SlimFit MPR 1550 (some SKUs) 16x25x4 15.5 × 24.5 × 3.75 Amazon SlimFit listing title “exact dimensions 15.5 x 24.5 x 3.75”
Nordic Pure 16x25x4 pleated 16x25x4 Approximately 15.5 × 24.5 × 3.63 (15½ × 24½ × 3⅝) JB Tools listings 16x25x4M8-6 and 16x25x4M13-6. Nordic Pure’s own 16x25x4 page did not print a numeric actual until options were selected

If the old cartridge is Honeywell-class ~4.38 (4-3/8) thick, a Nordic Pure or Filterbuy 3.63-inch (3-5/8) pack is a different part. JB Tools’ Nordic Pure copy says a 4-3/8 Honeywell replacement is their 16x25x5 SKU at about 15.75 × 24.75 × 4.38 — that is not this 16x25x4 page. Filtrete 4.31 vs Honeywell 4.38 is a smaller gap, but still measure. 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 MERV 13 is not HEPA. Four-inch media usually handles MERV 11–13 with less pressure drop than a 1-inch MERV 13; that is a pressure-drop observation, not a health claim. We do not claim health outcomes.

MERV EPA average capture efficiency (particle size) Typical 16x25x4 use
8 ≥20% of 1.0–3.0 µm; ≥70% of 3.0–10.0 µm Common pleated replacement when the cabinet manual does not call for higher (Honeywell CF100A1009 was MERV 8)
11 ≥20% of 0.30–1.0 µm; ≥65% of 1.0–3.0 µm; ≥85% of 3.0–10.0 µm Mid-grade 4-inch media (Honeywell FC100A1029 is specified MERV 11; 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 4-inch; confirm the air handler can take the extra pressure drop. Still not HEPA

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. Honeywell CF200A1008 was labeled MERV 12 on the Store page — that is between 11 and 13 on the EPA table.

Where these prices came from

Pack prices checked 30 Aug 2026

Amazon rows re-checked 27 Sep 2026 against the live featured-offer buy-box in a headed browser (Buy links now open the exact listing named in each row). Other merchants keep their own stamps.

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. Honeywell Store 16x25x4 SKUs (CF100A1009, CF200A1008) are discontinued and have no current cart price.

Observed range that day: about $18–$24/filter at MERV 8 in multi-packs (the 3-5/8 Nordic Pure/Filterbuy packs sit at the low end; BestAir’s 4¼-inch Honeywell-replacement 3-pack is $24.00), $17.49–$31.33 at MERV 11 (Filterbuy 6-pack vs BestAir 3-pack — different actual depth), $17.00–$30.99 at Filtrete MERV 12, $24–$31 at MERV 13 in multi-packs. Singles cost more than multi-packs. Nordic Pure Buy buttons now go through Awin to nordicpure.com (pick MERV and pack on the factory page). Factory cart pack prices for listed MERV 8 and MERV 13 6-packs were verified 15 Sep 2026 from nordicpure.com. Amazon Basics had no 16x25x4 listing that printed an actual size, so that brand is omitted. Walmart Filtrete 4-pack pages returned a bot check, so those pack prices are omitted rather than guessed.

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 16x25x4 SKU. A 16x25x1 or 16x25x5 is not a substitute for this cabinet unless the published actual (especially depth) matches the old cartridge.

Sources

Sources (accessed 30 Aug 2026)

  • EPA MERV table: epa.gov/indoor-air-quality-iaq/what-merv-rating (updated 14 Jan 2026)
  • Honeywell Store CF200A1008 (15.94×24.87×4.38, discontinued) and CF100A1009 (15.93×24.87×4.38, discontinued). Resideo FC100A1029/U lists 16 in × 25 in only — no fractional actual on that spec sheet
  • Amazon Filtrete (buy-box re-checked 16 Oct 2026) B09RQCMR5V MPR 1000 2-pack $46.79 (was $47.99 on 13 Oct; 15.88×24.56×4.31); B09RQBQ776 MPR 1550 2-pack: no new offer on 15 or 16 Oct (Amazon showed only a used one) — Not verified, last seen $33.99 new on 14 Oct. MERV 13 2-pack title 15.44×24.62×4.31; SlimFit title 15.5×24.5×3.75
  • JB Tools Nordic Pure 16x25x4M8-6 $107.99 and 16x25x4M13-6 $143.99 (actual ~15.5×24.5×3.63). Nordic Pure factory 16x25x4 page: no numeric actual or price until options selected
  • Amazon Filterbuy B09B45PYTS MERV 8 3-pack $62.97 (re-checked 27 Sep 2026), actual 15.50×24.50×3.63 on that product page. No Amazon Basics 16x25x4 listing with a printed actual was found. Walmart Filtrete 4-pack bot-blocked