FilterBySize Furnace and AC filter sizes, actual dimensions, MERV

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16x25x5 air filter: actual size, MERV, and price

A 16x25x5 is five-inch-class media for a dedicated cabinet — Aprilaire/Space-Gard, Lennox, and Honeywell 4-3/8 replacements that are often sold as 16x25x5. It is not a 1-inch slot filter. Buy the printed size 16x25x5. The cartridge is smaller than that label, and actual depth varies more by brand than on 1-inch panels (about 4.3–5.3 inches shows up under the same 16x25x5 name). Measure the old cartridge before you order.

Same panel, swapped axes: 25x16x5. We treat 16x25x5 as the canonical label. Order 16x25x5. Do not substitute a 16x25x1. Do not substitute a 16x25x4. Nordic Pure and some resellers sell Honeywell 4-3/8-inch cartridges as 16x25x5. A true 5-inch Aprilaire cabinet is a different fit — measure the old cartridge depth.

Actual size by brand

These numbers are copied from manufacturer or merchant product copy, not from a competitor size chart. On 5-inch media, thickness is the fit: a Honeywell-class 4.38-inch (4-3/8) cartridge will not fill an Air Bear or Aprilaire slot that takes ~4.88–5 inches, and a 5.25-inch Goodman/Carrier pack will not slide into a Honeywell F100.

Brand Nominal Published actual (in.) Source
Honeywell Home CF200A1008 (4-inch Ultra Efficiency, MERV 12; Honeywell Store, discontinued). Store title is 16x25x4 / 16x25x4.5, not 16x25x5; this is the 4-3/8 cartridge resellers sell as 16x25x5 16x25x4.5 (Honeywell); often sold as 16x25x5 15.94 × 24.87 × 4.38 Honeywell Store product specs (“Actual Dimensions: 15.94 x 24.87 x 4.38 in.”); listed as exceeding FC100A1029; “Easily fits Aprilaire/Space-Gard models 2200 & 2252”
Honeywell Home CF100A1009 (4-inch High Efficiency, MERV 8; Honeywell Store, discontinued) 16x25x4.5 (Honeywell); often sold as 16x25x5 15.93 × 24.87 × 4.38 Honeywell Store product specs (“Actual Dimensions: 15.93 x 24.87 x 4.38 in.”); “Easily fits Aprilaire/Space-Gard models 2200 & 2250”
Nordic Pure 16x25x5 Honeywell/Lennox replacement (JB Tools 16x25x5HM… SKUs) 16x25x5 Approximately 15.75 × 24.75 × 4.38 (15¾ × 24¾ × 4⅜) JB Tools listings (e.g. 16x25x5HM8-2, 16x25x5HM13-2). Nordic Pure’s Honeywell replacements page prints 15 3/4 × 24 3/4 × 4 3/8 for 203719, FC100A1029, FC35A1001. Nordic Pure’s own 16x25x5 product page did not print a numeric actual until options were selected
Filterbuy 16x25x5 pleated for Honeywell FC100A1029 / Lennox X6670 (Target and Amazon product pages) 16x25x5 15.75 × 24.75 × 4.38 Printed in those merchants’ own product titles and dimensions fields (e.g. Target A-1007574239; Amazon B00NVF4U1G). Not taken from a Filterbuy comparison chart
Filtrete 16x25x5 MPR 1000 / MERV 11 and SlimFit MPR 1900 / MERV 13 (typical Lennox packs) 16x25x5 15.63 × 24.74 × 4.31 Amazon titles and “exact dimensions” copy, B0BVXJG134 and B0F9LS43QT; listed as fitting Lennox media air cleaners. Fits systems calling for 4.31" and larger
Filtrete 16x25x5 MPR 1550 / MERV 12 (Honeywell & Trion AirBear SKU) 16x25x5 15.75 × 24.13 × 4.88 Amazon product title and “exact dimensions” copy, B01MTNH7G9. Fits systems calling for 4.88" and larger — not the 4.31 Lennox SlimFit and not Honeywell 4-3/8
Nordic Pure 16x25x5 Air Bear / GeneralAire-class (factory exact-size page) 16x25x5 15.625 × 24.125 × 4.875 (15⅝ × 24⅛ × 4⅞) Nordic Pure product page 15-625x24-125x4-875; GeneralAire replacements page prints 15 5/8 × 24 1/8 × 4 7/8. A different 16x25x5 SKU from their Honeywell 4-3/8 pack

If the old cartridge is Honeywell-class ~4.38 (4-3/8) thick, a Filtrete AirBear 4.88-inch pack or a 5.25-inch Goodman/Carrier 16x25x5 is a different part. Filtrete Lennox 4.31 vs Honeywell 4.38 is a smaller gap, but still measure. Aprilaire’s shop lists 410/413/416 as 16x25x4 (actual 16.52 × 29.38 × 4) — that is not this 16x25x5 page. Space-Gard 2400 media is commonly 16x25x6, not 16x25x5. Full method: how to measure.

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. Five-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 16x25x5 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 5-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 5-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.

Pack prices checked 30 Aug 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. Honeywell Store 16x25x4.5 SKUs (CF100A1009, CF200A1008) are discontinued and have no current cart price. Depths below are not interchangeable — a 4.31 Filtrete Lennox pack is not a Honeywell 4-3/8.

Listing MERV Pack Price that day Per filter Merchant
Nordic Pure 16x25x5 Honeywell/Lennox (actual ~15.75×24.75×4.38; reseller) 8 2 $48.59 $24.30 JB Tools
Nordic Pure 16x25x5 Honeywell/Lennox (actual ~15.75×24.75×4.38; reseller) 8 4 $98.99 $24.75 JB Tools
Filterbuy 16x25x5 Honeywell FC100A1029 (actual 15.75×24.75×4.38) 8 2 $50.98 $25.49 Amazon
Filtrete 16x25x5 MPR 1000 Allergen Defense (Lennox; actual 15.63×24.74×4.31) 11 2 $48.14 $24.07 Amazon
Filterbuy 16x25x5 Honeywell FC100A1029 (actual 15.75×24.75×4.38) 11 4 $109.96 $27.49 Target
Filterbuy 16x25x5 Honeywell FC100A1029 (actual 15.75×24.75×4.38) 11 2 $59.98 $29.99 Target
Nordic Pure 16x25x5 Honeywell/Lennox (actual ~15.75×24.75×4.38; reseller) 12 1 $33.29 $33.29 JB Tools
Filterbuy 16x25x5 Honeywell FC100A1029 (actual 15.75×24.75×4.38) 13 4 $136.96 $34.24 Target
Filtrete 16x25x5 SlimFit MPR 1900 (Lennox; actual 15.63×24.74×4.31) 13 2 $72.08 $36.04 Amazon
Nordic Pure 16x25x5 Honeywell/Lennox (actual ~15.75×24.75×4.38; reseller) 13 2 $72.89 $36.45 JB Tools

Observed range that day: about $24.30–$25.49/filter at MERV 8 in 2- and 4-packs (Honeywell 4-3/8 Nordic Pure and Filterbuy), $24.07–$29.99 at MERV 11 (Filtrete Lennox 4.31 2-pack vs Filterbuy 4.38 2-pack — different actual depth), $33.29 at Nordic Pure MERV 12 as a 1-pack, $34.24–$36.45 at MERV 13 in multi-packs of the Honeywell 4-3/8 class (Filterbuy 4-pack vs Nordic Pure 2-pack); the Filtrete SlimFit MERV 13 2-pack at $36.04 is the 4.31 Lennox actual, not 4.38. Singles cost more than multi-packs. Nordic Pure’s own 16x25x5 page did not show a price until MERV and pack were selected; the JB Tools figures are a reseller snapshot, not Nordic Pure’s factory cart. Amazon Basics had no 16x25x5 listing that printed an actual size, so that brand is omitted. Filtrete AirBear (actual 15.75×24.13×4.88) Amazon B01MTNH7G9 showed used/marketplace offers only, so that pack price is omitted rather than guessed. Target Filtrete 16x25x5 (A-92295871) did not print an actual size in the public copy we loaded. Lowe’s Filtrete 16x25x5 (50129916) returned a privacy/bot page, so that row is omitted. Aprilaire shop 16x25x5 SKUs with published actuals were not found (410/413/416 are listed 16x25x4).

Where to buy

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

Sources (accessed 30 Aug 2026)