Hero image 0 of Filter King 21x21x1 Air Filter | 4-PACK | MERV 11 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 20.5 x 20.5 x .75", 0 of 1

Filter King

Filter King 21x21x1 Air Filter | 4-PACK | MERV 11 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 20.5 x 20.5 x .75"

Name: Filter King 21x21x1 Air Filter | 4-PACK | MERV 11 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 20.5 x 20.5 x .75"
Brand: Filter King
SKU: 5267919646
Price: 49.84 USD
Availability: InStock
Rating: 4.7 (6 reviews)

|6 ratings

Key item features

Specs

Air filter size
20 x 20 x 1
Brand
Filter King
Features
Pleated
Thickness
0.75 in
Rec. use
Residential
Dimensions
20.50 x 20.50 x 0.75 Inches

Current price is $49.84

Price when purchased online

Free shipping
Free 30-day returns

Include a special request

Add

How do you want your item?

Ships to

Arrives by Fri, May 15

Sold and shipped by Filter King LLC

4.552147239263804 stars out of 5, based on 326 seller reviews(4.6)

Report an issue with this seller

Free 30-day returns

About this item

Product details

Filter King Merv 11 21x21x1 4-Pack Air Filter actual size is 20.5x20.5x.75. Our 21x21x1 Furnace Filters are designed to last up to 90 days. These pleated 1-inch air filters are ideal for maintaining the efficiency of your heating and cooling systems. Make sure you measure your filter. The actual size of this pleated Merv 11 filter is 20-1/2 x 20-1/2 x 3/4

Filter King 21x21x1 Air Filter | 4-PACK | MERV 11 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 20.5 x 20.5 x .75"

info:

We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.

Specifications

Air filter size

20 x 20 x 1

Brand

Filter King

Features

Pleated

Thickness

0.75 in

Warranty

Warranty information

Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.

Similar items you might like

Based on what customers bought

Filter King 13.5x18.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 13.5 x 18.5 x .75" $53.52
current price $53.52
Filter King 13.5x18.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 13.5 x 18.5 x .75"
5 out of 5 Stars. 1 reviews
Filter King 17.25x29.25x1 Air Filter | 2-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 17.25 x 29.25 x .75" $39.08
current price $39.08
Filter King 17.25x29.25x1 Air Filter | 2-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 17.25 x 29.25 x .75"
4.8 out of 5 Stars. 6 reviews
Filter King 15.5x27.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15.5 x 27.5 x .75" $52.44
current price $52.44
Filter King 15.5x27.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15.5 x 27.5 x .75"
Filter King 19.88x21.5x1 Air Filter | 4-PACK | MERV 11 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 19.88 x 21.5 x .75" $49.84
current price $49.84
Filter King 19.88x21.5x1 Air Filter | 4-PACK | MERV 11 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 19.88 x 21.5 x .75"
5 out of 5 Stars. 20 reviews
Filter King 15x30.5x1 Air Filter | 3-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15 x 30.5 x .75" $55.53
current price $55.53
Filter King 15x30.5x1 Air Filter | 3-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15 x 30.5 x .75"
Filter King 9x6x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 9 x 6 x .75" $59.44
current price $59.44
Filter King 9x6x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 9 x 6 x .75"
Filter King 11.75x11.75x1 Air Filter | 4-PACK | MERV 13 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 11.75 x 11.75 x .75" $44.84 Was $74.80
current price $44.84, Was $74.80
Filter King 11.75x11.75x1 Air Filter | 4-PACK | MERV 13 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 11.75 x 11.75 x .75"
5 out of 5 Stars. 127 reviews
Filter King 24.5x24.5x2 Air Filter | 5-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 24.5 x 24.5 x 1.75" $52.45
current price $52.45
Filter King 24.5x24.5x2 Air Filter | 5-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 24.5 x 24.5 x 1.75"
Filter King 22.5x25x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 22.5 x 25 x .75" $73.72
current price $73.72
Filter King 22.5x25x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 22.5 x 25 x .75"
Filter King 16.5x17x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 16.5 x 17 x .75" $73.40
current price $73.40
Filter King 16.5x17x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 16.5 x 17 x .75"
Filter King 24.5x13.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 24.5 x 13.5 x .75" $34.88
current price $34.88
Filter King 24.5x13.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 24.5 x 13.5 x .75"
5 out of 5 Stars. 1 reviews
Filter King 16x11x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 16 x 11 x .75" $50.36
current price $50.36
Filter King 16x11x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 16 x 11 x .75"
5 out of 5 Stars. 127 reviews
Filter King 10x24x1 Air Filter | 2-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 9.5 x 23.5 x .75" $30.84
current price $30.84
Filter King 10x24x1 Air Filter | 2-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 9.5 x 23.5 x .75"
5 out of 5 Stars. 126 reviews
Filter King 10x18x1 Air Filter | 2-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 10 x 18 x .75" $46.72
current price $46.72
Filter King 10x18x1 Air Filter | 2-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 10 x 18 x .75"
5 out of 5 Stars. 127 reviews
Filter King 16.25x21.5x1 Air Filter | 3-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 16.25 x 21.5 x .75" $50.31
current price $50.31
Filter King 16.25x21.5x1 Air Filter | 3-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 16.25 x 21.5 x .75"
4.9 out of 5 Stars. 18 reviews
Filter King 15.5x23.5x4 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15.5 x 23.5 x 3.75" $42.00
current price $42.00
Filter King 15.5x23.5x4 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15.5 x 23.5 x 3.75"
5 out of 5 Stars. 140 reviews
Filter King 5.5x13.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 5.5 x 13.5 x .75" $49.99
current price $49.99
Filter King 5.5x13.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 5.5 x 13.5 x .75"
4.8 out of 5 Stars. 4 reviews
Filter King 10x36x1 Air Filter | 3-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 9.5 x 35.5 x .75" $47.37
current price $47.37
Filter King 10x36x1 Air Filter | 3-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 9.5 x 35.5 x .75"
5 out of 5 Stars. 140 reviews
Filter King 13.5x9.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 13.5 x 9.5 x .75" $46.84
current price $46.84
Filter King 13.5x9.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 13.5 x 9.5 x .75"
Filter King 18x18.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 18 x 18.5 x .75" $66.56
current price $66.56
Filter King 18x18.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 18 x 18.5 x .75"

Customer ratings & reviews

4.7 out of 5 stars

stars6 ratings6 reviews

How item rating is calculated

Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.

Sort by |

Showing 1-3 of 6 reviews

Nov 6, 2025

Michael s.

5 out of 5 stars review

Seller Verified Purchase

Pure Awesomeness

Excellent product keeps the house air clean

Review from filterking.com

Helpful?

Sep 2, 2024

renata

5 out of 5 stars review

Seller Verified Purchase

Always reliable

Have ordered a few times and great filters. Best part is that if there are any issues, they are very responsive and fix issues )such as shipping) quickly

Review from filterking.com

Helpful?

May 4, 2024

Cathy W.

5 out of 5 stars review

BEST OF BEST IS FILTER KING

Filter King is the company to use for all your filter needs. They are very attentive to your needs when it comes to filter ordering. I will always get my filters from Filter King!!! You should too!

Review from filterking.com

Helpful?

Rewards debit card.Earn 3% cash back, on up to $150spent each month.Terms apply.

Join OnePay Cash

Rollbacks & more

Mother's Day

Grocery

Clothing, Shoes, & Accessories

Baby & Kids

Pharmacy, Health & Wellness

Home, Garden & Tools

Electronics

Gaming

Auto & Tires

Personal Care

Beauty

Toys & Outdoor Play

Household Essentials

Pet Supplies

School, Office & Art Supplies

Sports & Outdoors

Books, Movies, & Music

Collectibles

Party Supplies

Auto Care Services

Pharmacy

Health Services

Vaccines

Vision Center

Benefit Programs

Insurance Services

Lists

Registries

Gift Cards

Spark Good

Custom Cakes

Custom Cupcakes

Featured

Photo Gifts

OnePay Hub

Money & Other Services

Gift Cards

Protection Services

Home & Tech Services

Subscriptions

Subscription Products

Walmart Business

Industry solutions

It’s easier in the app

Pickup & Delivery

Get inspired

Filter King 21x21x1 Air Filter | 4-PACK | MERV 11 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 20.5 x 20.5 x .75"

Key item features

Specs

How do you want your item?

About this item

Product details

Specifications

Air filter size

Brand

Features

Thickness

Warranty

Warranty information

Similar items you might like

Based on what customers bought

Filter King 13.5x18.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 13.5 x 18.5 x .75" $53.52

Filter King 13.5x18.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 13.5 x 18.5 x .75"

Filter King 17.25x29.25x1 Air Filter | 2-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 17.25 x 29.25 x .75" $39.08

Filter King 17.25x29.25x1 Air Filter | 2-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 17.25 x 29.25 x .75"

Filter King 15.5x27.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15.5 x 27.5 x .75" $52.44

Filter King 15.5x27.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15.5 x 27.5 x .75"

Filter King 19.88x21.5x1 Air Filter | 4-PACK | MERV 11 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 19.88 x 21.5 x .75" $49.84

Filter King 19.88x21.5x1 Air Filter | 4-PACK | MERV 11 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 19.88 x 21.5 x .75"

Filter King 15x30.5x1 Air Filter | 3-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15 x 30.5 x .75" $55.53

Filter King 15x30.5x1 Air Filter | 3-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 15 x 30.5 x .75"

Filter King 9x6x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 9 x 6 x .75" $59.44

Filter King 9x6x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 9 x 6 x .75"

Filter King 11.75x11.75x1 Air Filter | 4-PACK | MERV 13 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 11.75 x 11.75 x .75" $44.84 Was $74.80

Filter King 11.75x11.75x1 Air Filter | 4-PACK | MERV 13 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 11.75 x 11.75 x .75"

Filter King 24.5x24.5x2 Air Filter | 5-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 24.5 x 24.5 x 1.75" $52.45

Filter King 24.5x24.5x2 Air Filter | 5-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 24.5 x 24.5 x 1.75"

Filter King 22.5x25x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 22.5 x 25 x .75" $73.72

Filter King 22.5x25x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 22.5 x 25 x .75"