Filterbuy 21x21x4.5 Rheem RXFH-E21AM10, RXFH-E21AM13 Compatible MERV 11 Air Filter

Great customer service and product. I accidentally ordered the wrong size and the refund process was so simple that I will order from here the rest of my life. Great company.

I have an unusual MERV 11 filter element in my system. Filterbuy had it on mu door step in less than 24 hours.

Costumer services. I'd like to compliment your employees, for the excellent services they provide me, when I contact them for the Air filters. The professionalism and ability to get this process done quickly exceeded my expectations. Such a commitment to great costumer services is to be commended. You are be sure that I will continue to do business with Filter buy for years to come. Thank you.

I was able to buy this online and receive it in a few days. This filter is not sold in any of the big box stores, so I was pleasantly surprised. I did not realize my husband ordered the same filter through our AC repairman. He dropped it off and charged us more than twice what we paid through Filterbuy. I highly recommend them!

One word describes the product, the company, and the service. Perfect.