Fits checked Oct 1, 2026 · How we check
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AprilAire · media air cleaner · media air cleaner cabinet

AprilAire U243 replacement filter

Use part UK413, or any one of UK411. Lasts up to 12 months.

Any one of these fits · standard choice

Maker lists this model

AprilAire UK413 MERV 13 + rails

AprilAire UK413 (Replaces 413) MERV 13 TriPure Filter + Upgrade Rails

Part number
UK413
How many
1 per unitpacks: UK413 02 (2), UK413 04 (4)
How often
Lasts up to 12 months
Size
16 x 25 x 4 in16 x 25 x 4 in nominal (17.29 x 29.75 x 3.68 actual)

AprilAire lists the U243 on the UK413 page (MERV 13); the UK413 bundles one-time upgrade rails that older cabinets need, and the filter-only refill is the 3F413.

Buy UK413 MERV 13 + rails on AmazonManufacturer page

Opens an Amazon search for AprilAire UK413 MERV 13 + rails. Check the listing says UK413.

See the sources

Compare the 2 options

The U243 holds one filter at a time. Any one of these fits; AprilAire ships it with the first one.

FilterGradeSizeHow oftenBuy
UK413 MERV 13 + railsUK413standard choiceMERV 13 TriPure 3-inch filter, one-time upgrade rails16 x 25 x 4 inLasts up to 12 monthsAmazon
UK411 MERV 11 + railsUK411MERV 11 TriPure 3-inch filter, one-time upgrade rails16 x 25 x 4 inLasts up to 12 monthsAmazon

Other genuine options from AprilAire

Variants and kits the maker sells for this model. Same fit, different media or packaging.

  • 3F413 filter only (ships in the U243; AprilAire's subscription refill)
    3F413 · Find on Amazon

Sources

High confidence: the manufacturer names this exact model on a live page. Each line is the page we read and the day we read it.

  • Which filter fits shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Compatible Models: 1410, 1610, 2140, 2400, 2410, 2416, 3410, 4400, U141, U243, U161, U171
  • How many shop.aprilaire.com Maker's own page checked Oct 1, 2026
    INCLUDED IN THE BOX: (1) U243 Air Purifier (1) 3F413 Air Filter; Filter Nominal Dimensions (H x W): 16 x 25 (inches)
  • How often shop.aprilaire.com Maker's own page checked Oct 1, 2026
    LONG FILTER LIFE – One filter lasts up to 12 months
  • Size shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Nominal Measurements: 16H x 25W x 4D (inches) Actual Measurements: 17.29H x 29.75W x 3.68D (inches)
  • What's in it shop.aprilaire.com Maker's own page checked Oct 1, 2026
    MERV Rating: 13; Materials: Plastic, Synthetic Fiber
  • Packs shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package sizes: 1-pack UK413; 2-pack UK413 02; 4-pack UK413 04
Show all 16 sources

Which filter fits

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Compatible Models: 1410, 1610, 2140, 2400, 2410, 2416, 3410, 4400, U141, U243, U161, U171
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Compatible Models: 1410, 1610, 2140, 2400, 2410, 2416, 3410, 4400, U141, U243, U161, U171
  3. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Page for the U243 (per its URL): Replaces AprilAire 2410 Whole-House Air Purifier
  4. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Product 'AprilAire UK413 (Replaces 413) MERV 13 TriPure Filter + Upgrade Rails', SKUs UK413, UK413 02, UK413 04
  5. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    The AprilAire UK413 replaces the sunsetting AprilAire 413 Filter; 'Your next subscription will be the 3F413 - filter only'
  6. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Product 'AprilAire UK411 (Replaces 410) MERV 11 TriPure Filter + Upgrade Rails', SKUs UK411, UK411 02, UK411 04
  7. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    The AprilAire UK411 replaces the sunsetting AprilAire 410 Filter; 'Your next subscription will be the 3F411 - filter only'

How many

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    INCLUDED IN THE BOX: (1) U243 Air Purifier (1) 3F413 Air Filter; Filter Nominal Dimensions (H x W): 16 x 25 (inches)

How often

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    LONG FILTER LIFE – One filter lasts up to 12 months
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    LONG FILTER LIFE – One filter lasts up to 12 months

Size

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Nominal Measurements: 16H x 25W x 4D (inches) Actual Measurements: 17.29H x 29.75W x 3.68D (inches)
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Nominal Measurements: 16H x 25W x 4D (inches) Actual Measurements: 17.29H x 29.75W x 3.68D (inches)

What's in it

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    MERV Rating: 13; Materials: Plastic, Synthetic Fiber
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    MERV Rating: 11; Materials: Plastic, Synthetic Fiber

Packs

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package sizes: 1-pack UK413; 2-pack UK413 02; 4-pack UK413 04
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package sizes: 1-pack UK411; 2-pack UK411 02; 4-pack UK411 04