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

AprilAire U151 replacement filter

Use part UK511, or any one of UK513. Lasts up to 12 months.

Any one of these fits · standard choice

Maker lists this model

AprilAire UK511 MERV 11 + rails

AprilAire UK511 (Replaces 510) MERV 11 TriPure Filter + Upgrade Rails

Part number
UK511
How many
1 per unitpacks: UK511 02 (2), UK511 04 (4)
How often
Lasts up to 12 months
Size
31 x 28 x 4 in31 x 28 x 4 in nominal (29.74 x 29.75 x 3.68 actual)

AprilAire lists the U151 on the UK511 page (MERV 11); the UK511 bundles one-time upgrade rails that older cabinets need, and the filter-only refill is the 3F511.

Buy UK511 MERV 11 + rails on AmazonManufacturer page

Opens an Amazon search for AprilAire UK511 MERV 11 + rails. Check the listing says UK511.

See the sources

Compare the 2 options

The U151 holds one filter at a time. Any one of these fits; AprilAire ships it with the first one.

FilterGradeSizeHow oftenBuy
UK511 MERV 11 + railsUK511standard choiceMERV 11 TriPure 3-inch filter, one-time upgrade rails31 x 28 x 4 inLasts up to 12 monthsAmazon
UK513 MERV 13 + railsUK513MERV 13 TriPure 3-inch filter, one-time upgrade rails31 x 28 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.

  • 3F511 filter only (ships in the U151; AprilAire's subscription refill)
    3F511 · 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: 1510, 2516, U151
  • How many shop.aprilaire.com Maker's own page checked Oct 1, 2026
    INCLUDED IN THE BOX: (1) U151 Air Purifier (1) 3F511 Air Filter; Filter Nominal Dimensions (H x W): 31 x 28 (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: 31H x 28W x 4D (inches) Actual Measurements: 29.74H x 29.75W x 3.68D (inches)
  • What's in it shop.aprilaire.com Maker's own page checked Oct 1, 2026
    MERV Rating: 11; Materials: Plastic, Synthetic Fiber
  • Packs shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package sizes: 1-pack UK511; 2-pack UK511 02; 4-pack UK511 04
Show all 16 sources

Which filter fits

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Compatible Models: 1510, 2516, U151
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Compatible Models: 1510, 2516, U151
  3. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Page for the U151 (per its URL): Replaces AprilAire 1510 Whole-House Air Purifier
  4. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Product 'AprilAire UK511 (Replaces 510) MERV 11 TriPure Filter + Upgrade Rails', SKUs UK511, UK511 02, UK511 04
  5. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    The AprilAire UK511 replaces the sunsetting AprilAire 510 Filter; 'Your next subscription will be the 3F511 - filter only'
  6. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Product 'AprilAire UK513 (Replaces 513) MERV 13 TriPure Filter + Upgrade Rails', SKUs UK513, UK513 02, UK513 04
  7. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    The AprilAire UK513 replaces the sunsetting AprilAire 513 Filter; 'Your next subscription will be the 3F513 - filter only'

How many

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    INCLUDED IN THE BOX: (1) U151 Air Purifier (1) 3F511 Air Filter; Filter Nominal Dimensions (H x W): 31 x 28 (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: 31H x 28W x 4D (inches) Actual Measurements: 29.74H x 29.75W x 3.68D (inches)
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Nominal Measurements: 31H x 28W x 4D (inches) Actual Measurements: 29.74H 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: 11; Materials: Plastic, Synthetic Fiber
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    MERV Rating: 13; Materials: Plastic, Synthetic Fiber

Packs

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package sizes: 1-pack UK511; 2-pack UK511 02; 4-pack UK511 04
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package sizes: 1-pack UK513; 2-pack UK513 02; 4-pack UK513 04