100% Free U.S. Shipping

Free shipping, free returns

21x21x4 MERV 13 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 13 for the replacement air filter

MERV 13 / Platinum

Best

3 Month Filter

21x21x4 MERV 13 filters made and manufactured by FilterBuy
Actual Size 20.5x20.5x3.75"
Hospital Grade. Attracts and captures airborne particles or allergens less than one micron in size such as pollen, fine dust, pet dander. Also captures bacteria, viruses carrying particles, mold spores and smoke.
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 13 Pleated Air Filter

20 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(20)
Questions(0)

Updating Results

06/27/22

Kathryn V.

12/11/21

Price right good service

James R.

07/02/21

Happy

John M.

11/27/20

excellent filter

Charla R.

02/15/19

Thank You!!

Your customer service is wonderful and very helpful! The A/C company I use charges twice as much for the same filters!

Jorge C.

05/20/17

The services is outstanding and

The services is outstanding and the filter is find. However I got a hard time when I re-order the filters to find the right measure. The actual filter size that I need is 21X21X5. This type of filter won’t show up on the measures filters. Thank you.

Save 5% with Subscription

Reviews for 21x21x4 MERV 13 Pleated Air Filter

WRITE A REVIEW

ASK A QUESTION