Based on 472 reviews
True to the name

I have had the MaxMerv9 in use for 5 years. It has worked great! I wash it once a month and it cleans up great. I will never need to buy another filter.

Wrong size

Are you a robot?
I responded with a plea for some help, as I ordered the wrong size and wondered if you could exchange 19x15 filters for 18x15 filters.

Fred Irwin


Yes finally I got a filter that works!

WOW what a nice filter! Thank you!

Custom 1 INCH Silver
Daniel Cuckler
Fits like a glove

Great custom size filter used in floor return. i had put in a custom frame with 2x1 wood to keep it off the bottom.

Bye bye cheap big box store filters!

Perfect fit and very well made! Also this is just my opinion but i feel like the air flow is a lot better i’m going based on the movement of my curtains their seems to be more airflow! Don’t hesitate to buy one of these permanent filters! Why spend 200-300 a year on cheap overseas filters! If i had to do it over again i would’ve gotten the even better platinum filter!


Washable filter fit great and seems to be the way to go

PLATINUM (1 INCH THICK) - The ULTIMATE Washable, Permanent, Electrostatic A/C Furnace Filter

Gold washable filter

Quality construction.with no apparent issues, would recommend. 👌

Custom 1 INCH Silver
Ken Rodericks
Perfect Fit

Perfect Fit on this custom filter order. Thanks. Ken R

Geo Filter

Great build on this permanent filter.


Great filters, fabulous company! Zero complaints after 10(?) years of using them. I love them so much I named my son NEVER BUY ANOTHER FILTER. Well, maybe

Great permanent filter

Great filter and air conditioner quieter since putting in new filter. Customer service very helpful..

Custom 1 INCH Silver
Krista Stump
Where do you find a custom size furnace filter? HERE!!

Our permanent filter on our furnace was about 12 years old and when you washed it, there was still dirt in it. We wanted to replace it but no one in our small town carried this custom size. I went on the internet and found, Never Buy Another Filter. My husband was leery but very pleased!

FedEx is a disaster

My order delivery address is clearly indicated, the front fmdoor is covered. FedEx delivered it to an apartment door (lower floor) with different street address that is uncovered. The package was buried in snow for two weeks. Never use FedEx!!!!!!!!!!!!!!

Great filter!

Custom size, great price point, washable. Very pleased with it!

expensive but well worth the price4. Perfect fit and is working great. thank you

Custom Size Air Filter

Ordered a custom size for my shop heater and fit very good.Thanks All!!

The Economical Flexible Washable, Permanent, Electrostatic A/C Furnace Filter

I like the ease with which this filter was inserted into my furnace. Although this is my first experience with a "flexible" filter and I just received it, I give it five (5) stars.

Filter review

Filter fit really good, seems to be well constructed. The only complaint I have is that it was damaged in shipping. The cardboard box had a hole punched in it and damaged the filter a bit. I installed it anyway, and I'll keep an eye on it or put a patch on the hole. I tried calling the number on the invoice and left voice mail but nobody called.

To early to Review give me a month

Christopher Trahan
Good buy


Furnace filter

Absolutely an excellent product. Great communication. I feel bad for this company, since I will never buy another filter. Thank you


Perfectly Made to the exact size i ordered, finely a Filter that Actually fits My Bard Geo thermal Heat Pump!

Very satisfied customer.

Perfect size, excellent quality, and great service.