Gadget Evaluator

HVAC Furnace Filter: Check the MERV Rating and Box Count

I break down the fine print for hvac furnace filter shoppers. This is for you if you need the exact size and count before you open the box. Short hvac…

In the box

I break down the fine print for hvac furnace filter shoppers. This is for you if you need the exact size and count before you open the box. Short hvac…

By Jonah Reeves · Home editor · Home desk · Gadget Evaluator Lab

Spec strip
ListingRating
20x20x4 MERV 11 Filter5.0Amazon
10x10x1 MERV 8 Filter4.9Amazon
20x25x1 MERV 11 Filter4.9Amazon
Filtrete 20x25x1 MERV 114.8Amazon
Filtrete 16x25x1 MERV 114.8Amazon
Filtrete 16x25x1 MERV 134.8Amazon
Filtrete 20x25x1 MERV 124.8Amazon
Filtrete 20x25x1 MERV 114.8Amazon
CAL16 16x25x5 HEPA Filter5.0Amazon

Jonah wouldn't reorder this if… The box contains the specific number of filters listed in the title. The size and MERV rating must match your furnace slot exactly.

You are not buying air; you are buying a physical barrier that fits a specific slot in your home. The chore is simple, but the fit is not.

Look at the title for the dimensions and the MERV number. That string is the only thing that matters for the fit.

  1. Best overall: 20x20x4 Air Filter Replacement MERV 11, FC100A1011 Pleated HVAC AC…
  2. Best value: 10x10x1 MERV 8 Air Filter 4-Pack for HVAC Furnance
  3. Upgrade pick: LotFancy 20x25x1 Air Filter MERV 11 4-Pack Pleated for Home…
  4. Lighter option: Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, 2 HVAC Filters
  5. Spare to keep: Filtrete 16x25x1 Air Filter, MERV 11, MPR 1000, 4 HVAC Filters
  6. Check the size: Filtrete 16x25x1 in. Air Filter, MERV 13, MPR 1900, 2 HVAC Filters
  7. Worth a second look: Filtrete 20x25x1 Air Filter, MERV 12, MPR 1500, 2 HVAC Filters
  8. Only if it fits: Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, 6 HVAC Filters
  9. Best overall: CAL16 Filter – 16xx25x5in (Actual Dims: 15 ½” x 24 ½” x 4 ⅜”in)…

Best overall

20x20x4 Air Filter Replacement MERV 11, FC100A1011 Pleated HVAC AC…

20x20x4 Air Filter Replacement MERV 11, FC100A1011 Pleated HVAC AC Furnace Filters with Wholesalehome Cleaning Cloth
20x20x4 Air Filter Replacement MERV 11, FC100A1011 Pleated HVAC AC Furnace Filters with Wholesalehome Cleaning Cloth, 2-Pack (Actual Size… — Amazon listing. View on Amazon
What fitsThe title specifies a 20x20x4 dimension with a MERV 11 rating, and the box includes a wholesale cleaning cloth alongside the two pleated filters.
What to checkThis is a specific size for standard residential units, not a universal fit.
Buy at Amazon

$62.91

Price copied from the Amazon listing when this was written. Check the live price.

Best value

10x10x1 MERV 8 Air Filter 4-Pack for HVAC Furnance

10x10x1 MERV 8 Air Filter 4-Pack for HVAC Furnance — hvac furnace filter for hvac furnace filter
10x10x1 MERV 8 Air Filter 4-Pack for HVAC Furnance — Amazon listing. View on Amazon
What fitsThis listing is for a 10x10x1 size with a MERV 8 rating, sold as a 4-pack.
What to checkIt is designed for smaller HVAC systems or portable units where a 1-inch depth is the standard requirement.
Buy at Amazon

$18.60

Price copied from the Amazon listing when this was written. Check the live price.

Upgrade pick

LotFancy 20x25x1 Air Filter MERV 11 4-Pack Pleated for Home…

LotFancy 20x25x1 Air Filter MERV 11 4-Pack Pleated for Home Furnace HVAC AC — hvac furnace filter for hvac furnace
LotFancy 20x25x1 Air Filter MERV 11 4-Pack Pleated for Home Furnace HVAC AC — Amazon listing. View on Amazon
What fitsThe title identifies this as a 20x25x1 pleated filter with a MERV 11 rating, sold in a 4-pack.
What to checkIt is a standard size for many residential furnace and AC units that use a 25-inch width.
Buy at Amazon

$39.99

Price copied from the Amazon listing when this was written. Check the live price.

Lighter option

Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, 2 HVAC Filters

Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, 2 HVAC Filters — hvac furnace filter for hvac furnace filter
Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, 2 HVAC Filters — Amazon listing. View on Amazon
What fitsThis is a Filtrete 20x25x1 filter with a MERV 11 rating and MPR 1000, sold as a 2-pack.
What to checkThe brand and size are clearly stated, targeting units that require this specific 20×25 dimension.
Buy at Amazon

$33.35

Price copied from the Amazon listing when this was written. Check the live price.

Spare to keep

Filtrete 16x25x1 Air Filter, MERV 11, MPR 1000, 4 HVAC Filters

Filtrete 16x25x1 Air Filter, MERV 11, MPR 1000, 4 HVAC Filters — hvac furnace filter for hvac furnace filter
Filtrete 16x25x1 Air Filter, MERV 11, MPR 1000, 4 HVAC Filters — Amazon listing. View on Amazon
What fitsThe title specifies a 16x25x1 size with a MERV 11 rating and MPR 1000, sold as a 4-pack.
What to checkThis is a common size for many residential HVAC systems that use a 16-inch width.
Buy at Amazon

$43.98

Price copied from the Amazon listing when this was written. Check the live price.

Check the size

Filtrete 16x25x1 in. Air Filter, MERV 13, MPR 1900, 2 HVAC Filters

Filtrete 16x25x1 in. Air Filter, MERV 13, MPR 1900, 2 HVAC Filters — hvac furnace filter for hvac furnace filter
Filtrete 16x25x1 in. Air Filter, MERV 13, MPR 1900, 2 HVAC Filters — Amazon listing. View on Amazon
What fitsThis listing is for a 16x25x1 filter with a MERV 13 rating and MPR 1900, sold as a 2-pack.
What to checkThe higher MERV rating indicates a finer filtration level than standard MERV 11 filters.
Buy at Amazon

$29.99

Price copied from the Amazon listing when this was written. Check the live price.

Worth a second look

Filtrete 20x25x1 Air Filter, MERV 12, MPR 1500, 2 HVAC Filters

Filtrete 20x25x1 Air Filter, MERV 12, MPR 1500, 2 HVAC Filters — hvac furnace filter for hvac furnace filter
Filtrete 20x25x1 Air Filter, MERV 12, MPR 1500, 2 HVAC Filters — Amazon listing. View on Amazon
What fitsThe title identifies this as a 20x25x1 filter with a MERV 12 rating and MPR 1500, sold as a 2-pack.
What to checkThis is a mid-range efficiency filter for units that use a 20-inch width.
Buy at Amazon

$29.49

Price copied from the Amazon listing when this was written. Check the live price.

Only if it fits

Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, 6 HVAC Filters

Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, 6 HVAC Filters — hvac furnace filter for hvac furnace filter
Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, 6 HVAC Filters — Amazon listing. View on Amazon
What fitsThis is a Filtrete 20x25x1 filter with a MERV 11 rating and MPR 1000, sold as a 6-pack.
What to checkThe larger pack size is aimed at users who want to stock up on this specific 20×25 dimension.
Buy at Amazon

$55.99

Price copied from the Amazon listing when this was written. Check the live price.

Best overall

CAL16 Filter – 16xx25x5in (Actual Dims: 15 ½” x 24 ½” x 4 ⅜”in)…

CAL16 Filter - 16xx25x5in (Actual Dims: 15 ½” x 24 ½” x 4 ⅜”in) - High-Performance Furnace/HVAC Filter - H12 HEPA
CAL16 Filter – 16xx25x5in (Actual Dims: 15 ½” x 24 ½” x 4 ⅜”in) – High-Performance Furnace/HVAC Filter – H12 HEPA Filter for HVAC – MERV … — Amazon listing. View on Amazon
What fitsThe title specifies a 16x25x5 size with a H12 HEPA rating, and the actual dimensions are listed as 15 ½” x 24 ½” x 4 ⅜”.
What to checkThis is a thicker filter than standard 1-inch or 4-inch options, designed for high-performance filtration.
Buy at Amazon

$129.00

Price copied from the Amazon listing when this was written. Check the live price.

Filters, bulbs, and the 11pm fix

How many filters are in the box?

The count is stated in the product title, so read that number before you add it to your cart.

What size does this filter fit?

The dimensions are listed in the title, and they must match the slot in your furnace.

What is the common complaint in reviews?

Shoppers often note that the filters are stiff and hard to slide into the frame.

What Jonah will actually plug in again

I cut anything that hides the size. A pretty bulb that does not name the base is a return.

  • Size, base, or filter code is in the Amazon title.
  • Photo from that listing.
  • No forced subscription you cannot kill.
  • Public rating when Amazon shows one.

Match the code on the old part before you buy. This is not a showroom.

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