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Web 25x20x1 MERV 8 Furnace Filter vs K&N 20x24x1 Furnace Air Filter

The K&N is the better filter for most homes. It is MERV 11 versus MERV 8, so it captures more pollen, mold spores and fine dust, and it is washable and reusable for years. The Web is a basic disposable pleated filter that fits a 25-inch slot; the K&N fits a 24-inch slot, so check your filter door size first. Owners rate the K&N well, though some note it needs a thorough rinse and full dry before reinstall.

  • Choose the Web if your return grille or filter slot is 25 inches long and you want a simple disposable filter you swap out and forget.
  • Choose the K&N if your slot is 24 inches long and you want higher MERV 11 filtration from a washable filter you reuse instead of replacing.

Prices

  • Web 25x20x1 MERV 8 Furnace Filter: $23.94 at Lowe's (checked today)
  • K&N 20x24x1 Furnace Air Filter: $59.99 at Walmart (checked today)
  • Difference: the Web 25x20x1 MERV 8 Furnace Filter is $36.05 cheaper than the K&N 20x24x1 Furnace Air Filter today
Web
Web 25-in W x 20-in L x 1-in Washable MERV 8 Furnace AC Filter

Web 25x20x1 MERV 8 Furnace Filter

Web 25-in W x 20-in L x 1-in Washable MERV 8 Furnace AC Filter

$23.94at Lowe'sChecked 13 h ago
See all prices and details
Visit Lowe's

Store links may earn us a commission. Price via Klarna.

Pros
  • Fits a 25-inch slot that 24-inch filters miss
  • Simple disposable design, no cleaning
  • MERV 8 is enough for basic dust control
  • Low maintenance routine
Cons
  • Lower MERV 8 filtration
  • Replaced repeatedly over time
  • No owner rating history to check
K&N
K&N 20x24x1 AC Furnace Air Filter, Merv 11

K&N 20x24x1 Furnace Air Filter

K&N 20x24x1 AC Furnace Air Filter, Merv 11

4.7(500 ratings)
$59.99at WalmartChecked 13 h ago
See all prices and details
Visit Walmart
Pros
  • MERV 11 captures more fine particles and allergens
  • Washable and reusable for years
  • Rated 4.7 out of 5 by 500 owners
  • Pleated synthetic media holds dust well
Cons
  • Must be rinsed and fully dried before reinstall
  • 24-inch length will not fit a 25-inch slot
  • Higher MERV can add resistance on weak blowers

What separates them

Web 25x20x1 MERV 8 Furnace FilterK&N 20x24x1 Furnace Air Filter
MERV ratingMERV 8MERV 11
Length25 in24 in
ReusableDisposable, replace when dirtyWashable and reusable for years
Filtration targetsDust and larger particlesDust, pollen, spores, bacteria and allergens
AirflowStandard pleated airflowDesigned for strong airflow at MERV 11
MaintenanceBuy and swap new filtersRinse, dry fully, reinstall
Owner feedbackLimited public ratings4.7 out of 5 from 500 ratings

Price history

$54.12$23.94
Nov 8Nov 15
  • Web 25x20x1 MERV 8 Furnace Filter: lowest $23.94 on Nov 8 at Lowe's; $23.94 on Nov 15.
  • K&N 20x24x1 Furnace Air Filter: lowest $54.12 on Nov 8 at TWIST; $54.12 on Nov 15.

Prices at every store

Web 25x20x1 MERV 8 Furnace Filter

  • Lowe'sNew

    In stock

    $23.94Checked 13 h ago
    Visit Lowe's

Store links may earn us a commission. Price via Klarna.

Prices and history →

K&N 20x24x1 Furnace Air Filter

  • WalmartNew

    In stockSold by K&NReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $59.99Free shippingChecked 13 h ago
    Visit Walmart
  • Lowe'sNew

    In stock

    $59.99Free shippingChecked 13 h ago
    Visit Lowe's
  • TWISTNew

    In stock

    $54.12+ $12.45 shippingChecked 13 h ago
    Visit TWIST
  • The Twister GroupNew

    In stock

    $54.12+ $12.45 shippingChecked 13 h ago
    Visit The Twister Group

Store links may earn us a commission. Some prices via Klarna.

All 7 stores and price history →

Specs compared

SpecWeb 25x20x1 MERV 8 Furnace FilterK&N 20x24x1 Furnace Air Filter
Width (")20.020.0
Filter TypeDust FilterDust Filter
Height (")1.0—
Depth (")25.0—
Quantity (pcs)—1
Size—20x24x1
color—Unknown

What reviewers say

K&N 20x24x1 Furnace Air Filter

  • 4.7 / 5500 ratings

Owners generally like the build quality and the savings from reusing one filter. Some find the cleaning routine more work than expected and notice reduced airflow when the filter is dirty.

What people mention
  • BuildPraisedOwners say the aluminum frame is rigid and lasts through repeated washings.
  • FiltrationPraisedUsers report less dust settling on surfaces after installing it.
  • MaintenanceMixedRinsing is simple, but the every-few-weeks schedule is more work than disposables.
  • AirflowCriticisedSome notice weaker airflow once the filter has collected dust.

Questions and answers

Which is better for allergies?
The K&N. Its MERV 11 rating captures pollen, spores and fine dust that a MERV 8 filter largely passes. The Web is fine for basic dust but not for allergy-focused filtration.
Which lasts longer?
The K&N, because it is washable and reused for years. The Web is disposable and gets thrown out once it loads up.
Will the K&N fit my furnace?
Only if your filter slot takes a 20x24x1. The Web is 20x25x1, so measure the slot before ordering. A filter that is too small lets air bypass the media.
Is MERV 11 too restrictive for my system?
Usually not. K&N designs this filter for strong airflow at MERV 11. If your blower is weak or your ductwork is undersized, watch for reduced airflow after install.
Is the K&N worth stepping up to over the Web?
Yes for most homes. You get higher filtration and a reusable filter instead of a disposable one. Skip it only if your slot is 25 inches or you want zero cleaning.
How do I clean the K&N?
Rinse it with water, let it dry completely, then reinstall. Putting it back damp can promote mold growth in the ductwork.

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  • Aircare 20x25x1 Permanent Washable Electrostatic HVAC Furnace Filter MERV 8 vs K&N 20x24x1 AC Furnace Air Filter, Merv 11
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  • K&N 20x24x1 AC Furnace Air Filter, Merv 11 vs Air-Care 10x10x1 Forever Filter, Permanent Washable Electrostatic HVAC Furnace Air Filter, MERV 8

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