100% Free U.S. Shipping

Free shipping, free returns

21x21x4 MERV 11 Pleated Air Filter

Made in the USA

Filterbuy ships replacement air filters in 24 hours icon

Ships in 24 Hours

Save 5% with Subscription

icon indicates a Minimum Efficacy Rating Value of 11 for the replacement air filter

MERV 11 / Gold

Superior

3 Month Filter

21x21x4 MERV 11 filters made and manufactured by FilterBuy
Actual Size 20.5x20.5x3.75"
Attracts and captures pet dander, lint, dust, pollen, dust mite debris, mold spores, smoke, and smog.
Ideal for standard and residential commercial use
Designed to last 90 days. Replace regularly for optimum performance.
Free shipping on all orders!
Learn more about 21x21x4 Air Filters.

Choose another Size

Other MERV Ratings Available

21x21x4
MERV 8
Silver
Standard

21x21x4
MERV 11
Gold
Superior

21x21x4
MERV 13
Platinum
Best

Save 5% with Auto Delivery

Made in the USA

Ships in 24 Hours

Reviews for 21x21x4 MERV 11 Pleated Air Filter

16 Reviews

0 Questions \ 0 Answers

ask a question

write a review

ask a question

write a review

Thank you for posting a review!

We value your input. Share your review so everyone else can enjoy it too.

Thank you for posting a review!

Your review was sent successfully and is now waiting for our staff to publish it.

Thank you for posting a question!

Please click on the link in the confirmation email we just sent you to submit your question.

Your question will appear on the site once someone answers it.

Reviews(16)
Questions(0)

Updating Results

09/24/21

Sal P.

03/05/20

Works GREAT 😎👍

Nino A.

12/21/18

Would buy again fast easy

Filters were as described fast delivery thanks!

James R.

07/02/21

Happy

Shawn F.

05/24/21

Filter purchase

Very pleased. Filters arrived quick and in good condition. I plan to reorder as needed.

John M.

11/27/20

excellent filter

Save 5% with Subscription

Reviews for 21x21x4 MERV 11 Pleated Air Filter

WRITE A REVIEW

ASK A QUESTION