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Furnace filter size

16x25x4 Furnace Filters

A cabinet size where the choice is between two part numbers from one maker, not between brands.

Both filters at this size are AprilAire parts for AprilAire whole-house air purifiers, and both listings state the part number first: 410 for the MERV 11 option and 413 for the MERV 13 one. On an AprilAire cabinet, that number is what the documentation calls for, and it is the thing to match.

Neither listing states an actual size, so this page draws no frame and makes no claim about how far under nominal the media sits. The cabinet is designed around these parts, which is a different situation from a generic one-inch slot where the actual dimension decides the fit.

This is the only place in the catalog where one cabinet offers a choice of rating. The 413 is the finest filter on the site, and the 410 gives the same cabinet a lower-resistance option. Which belongs in a given system is a question for the AprilAire documentation, not for this page.

What this catalog carries at 16x25x4

2 filters, at MERV 11 and MERV 13.

Stated figures at 16x25x4

  • AprilAire 410 16x25x4 MERV 11

    MERV
    MERV 11
    Pack
    1 per box

  • AprilAire 413 16x25x4 MERV 13, 2-pack

    MERV
    MERV 13
    Pack
    2 per box

Check the one you have first

  1. Confirm the equipment is an AprilAire cabinet rather than a generic four-inch housing; the part number on the old filter will say.
  2. Read the part number, 410 or 413 or another, from the frame of the filter coming out.
  3. Note the arrow direction on the old frame before it leaves the cabinet.
  4. Check the AprilAire documentation for which part numbers the cabinet accepts before changing from one to the other.

The arrow, and the schedule

Cabinet filters sit in rails behind a door, so a reversed one is hidden until the next service. The arrow points toward the blower here as it does on a one-inch filter, and it is worth photographing the old one in place before it comes out.

Deep filters hold more media, and AprilAire states its own intervals for these parts. Follow the interval stated for the specific part number and whatever the system documentation says, rather than assuming depth alone buys extra months.

A higher MERV rating is not an upgrade by default

The 413 at MERV 13 resists airflow more than the 410 at MERV 11 in the same cabinet. The equipment documentation states which parts the cabinet was designed around and which ratings the blower can carry, and that decides. Never choose the finer rating simply because the cabinet accepts both. If the documentation cannot be found, a licensed HVAC professional can advise on the specific equipment.

The 16x25x4 filters in this catalog

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AprilAire 410 16x25x4 MERV 11

AprilAire 410 16x25x4 MERV 11

  • Nominal 16x25x4
  • MERV 11

The lower-rated sibling of the 413: the listing states a genuine AprilAire 410 for AprilAire whole-house air purifiers, MERV 11, at a nominal 16x25x4, one per order. The same cabinet takes either part, which makes the 410 and 413 the one pair in this catalog where a rating choice exists inside a single four-inch cabinet. Which one belongs is a question for the AprilAire documentation.

What the listing supports, and what it does not
  • A genuine part with a stated part number for a named product line
  • MERV 11 resists airflow less than the MERV 13 option in the same cabinet
  • Nominal 16x25x4 is stated
  • One per order suits a household that replaces on a long interval
  • Only for an AprilAire cabinet that calls for the 410
  • Actual dimensions are not stated in the listing
  • Single filter per order costs more per unit than the 2-pack

Best forAn AprilAire whole-house purifier where the documentation allows the 410 and the household wants the lower resistance.

Check it on Amazon
AprilAire 413 16x25x4 MERV 13, 2-pack

AprilAire 413 16x25x4 MERV 13, 2-pack

  • Nominal 16x25x4
  • MERV 13
  • 2 per box

The finest-rated filter in this catalog, and a genuine part for a specific piece of equipment: the listing states an AprilAire 413 for AprilAire whole-house air purifiers, MERV 13, at a nominal 16x25x4. This is not a general furnace filter that happens to be deep — it is a cabinet part, and the 413 code is what the AprilAire documentation calls for. The listing states no actual size, so none appears here.

What the listing supports, and what it does not
  • A genuine part with a stated part number for a named product line
  • MERV 13 is the highest rating in this catalog
  • Two per order, and deep filters generally carry longer stated intervals
  • Nominal 16x25x4 is stated
  • Only for an AprilAire cabinet that calls for the 413; it is not a drop-in for a generic four-inch slot
  • Actual dimensions are not stated in the listing
  • MERV 13 resists airflow more than lower ratings; the equipment documentation decides whether it belongs

Best forAn AprilAire whole-house purifier whose documentation names the 413 filter.

Check it on Amazon

To repeat what is said at the top of the page: the Amazon links here are affiliate links and may earn this site a commission. Ordering, badges, and every claim on the page were decided from what the listings state, not from any commercial arrangement.

Other sizes and the scales behind them

Sources