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Convert your masks with Merv 14/90-95 filter inserts.
(Fits mosts mask. No fiberglass. Yellow soft-side faces wearer.)
Filter inserts are 5" x 6.75".
Package of 20 for $40 (free shipping).
Masks now available! $35 (free shipping).
(Masks are washable.)
Click here to order!
Returning customers, please login before ordering.
Stay healthy!
On orders over 500 individual inserts, please call for price — (210) 228-2833
If you questions about the masks, watch this instructional video.
Due to the overwhelmingly positive response, order processing & shipping time is between 3 to 5 days (subject to item availability). Thanks for your patience!
We clean the air you breathe.™
Our free home delivery
makes it a breeze!
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Why Are We Different? How Often Should I Change My AC Filters? What Filter Should I Buy?
Since 1995, we have been manufacturing the highest quality pleated air filters at our facility in San Antonio, Texas, USA. The air you breathe is our priority. When you buy filters from us, you get the best product available made by people who really care about quality — and clean air! The answer to this depends on your unique situation. Here are some variables to consider: if you live in an extremely hot climate where your AC is constantly running, filters ought to be changed once a month. In moderately warm climates, you can stretch that to two months. If your AC sits idle half the time, then every three months could make sense.

Another important factor to consider is the level of airborne allergens in your area. Allergens can come in from the outside — think dirt, dust, mold, pollen — or they might already be in the home — think family pets, dust mites, roaches, mice, mold. Also, think about things that are not allergens, but that can trigger attacks — cigarette or cigar smoke, wood smoke, sawdust, chemical sprays, perfumes. If you have any of the situations noted above, consider a more frequent filter replacement cycle.
Each filter has a MERV (minimum efficiency reporting value) rating. Residential ratings run from a high of 13 to a low of 1. The higher the number, the better the filtration. We offer you MERV 10, which is usually found in standard commercial buildings and better residences, and MERV 13, which is used in superior residential and superior commercial buildings.
Why Are We Different?
Since 1995, we have been manufacturing the highest quality pleated air filters at our facility in San Antonio, Texas, USA. The air you breathe is our priority. When you buy filters from us, you get the best product available made by people who really care about quality — and clean air!
How Often Should I Change My AC Filters?
The answer to this depends on your unique situation. Here are some variables to consider: if you live in an extremely hot climate where your AC is constantly running, filters ought to be changed once a month. In moderately warm climates, you can stretch that to two months. If your AC sits idle half the time, then every three months could make sense.

Another important factor to consider is the level of airborne allergens in your area. Allergens can come in from the outside — think dirt, dust, mold, pollen — or they might already be in the home — think family pets, dust mites, roaches, mice, mold. Also, think about things that are not allergens, but that can trigger attacks — cigarette or cigar smoke, wood smoke, sawdust, chemical sprays, perfumes. If you have any of the situations noted above, consider a more frequent filter replacement cycle.
What Filter Should I Buy?
Each filter has a MERV (minimum efficiency reporting value) rating. Residential ratings run from a high of 13 to a low of 1. The higher the number, the better the filtration. We offer you MERV 10, which is usually found in standard commercial buildings and better residences, and MERV 13, which is used in superior residential and superior commercial buildings.
Who is MERV and why should I care?
Rating Controlled Contaminant Application
1—4 Pollen, dust mites, cockroach debris, sanding dust, spray paint dust, textile fibers, carpet fibers Residential window AC units
5—8 Mold spores, dust mite debris, cat and dog dander, hair spray, fabric protector, dusting aids, pudding mix Better residential, general commercial, industrial workspaces
9—12 Legionella, humidifier dust, lead dust, milled flour, auto emission particulates, nebulizer droplets Superior residential, better commercial, hospital laboratories
13—16 Bacteria, droplet nuclei (sneeze), cooking oil, most smoke and insecticide dust, most face powder, most paint pigments Hospital & general surgery
You have questions? We have answers.

Filters4Air FAQ Q: Why should I worry about my AC filters?

A: Dirty filters mean more strain on your AC system, which means you spend more for energy. More importantly, do you really want to be breathing unclean air? Don’t you get enough of that running around the city? You want clean and healthy air in your home?

Q: How often should I change my filters?

A: The truth is – your filters work hard to keep your air clean whether you are running cold air or hot air. Think about it – your AC filter stops dirt, dust, pollen, auto emission particulates, allergens, animal dander and other airborne dirtiness. You really ought to change the filters once a month. How much is clean air and good health worth?

Q: How do I know what size I need?

A: Most AC filters have the size printed on the filter itself. Otherwise, simply measure the old filter or the ceiling or wall opening from edge to edge. Most filters are 1-inch, but we carry 2-inch and 4-inch as well.

Filters4Air FAQ Q: I see filters have something called a “MERV” rating. What is that exactly?

A: It is simply a industry-wide measurement rating to indicate the type of filter – it stands for Minimum Efficiency Reporting Value. MERV 9 to 12 levels are for superior residential, better commercial, and hospital laboratory use. Levels 13 to 16 are for the hospitals themselves and general surgery suites.

Q: What is the MERV rating of the filters from Filters4Air?

A: We offer MERV-10 and MERV-13. You will have clean air either way!

Q: How does your website sell these filters?

A: You select the size and quantity you want and set the shipping schedule. We setup a subscription for you. You can login to your account or notify us by email and make changes to any part of your subscription – including cancelling it (though we hope to earn your loyalty).

Q: Do you offer installation services?

A: Yes – just select it on the order page.

Q: What if I measure wrong – can I return the filter and get the correct size?

A: Absolutely – great companies have great customer service !!!
Our customers share the unfiltered truth about Filters4Air ...
We love Filters4Air and I hope you will check them out. I really like supporting local businesses and keeping my money here in San Antonio. - Jonathan D
Filters4Air is going above and beyond to get us a filter promptly. Their prices are very reasonable for the quality of the filter. - Elizabeth Y
I really enjoy the fact that the filters are waiting on my doorstep every filter cycle and I don't have to buy in bulk and figure out where to store them so they won't get damaged. - Trey C
I ordered today, assuming the filter would be here in several days from now. Much to my surprise, it was delivered a little while ago! Boy, talk about fast service!! - Gib J
Filters4Air makes changing my filters the easiest thing ever. I signed up and never had to think about it again. Thank you for doing such a great job and helping me simplify. - Andria A
The idea of a subscription filter service was new to me, but after a few hot summer months I realized I am a smart person -- thanks !!! - David M
Not only did I always forget to change my filters, I forgot the filter size. But after signing up with Filters4Air, I never have to think about it again. Thanks! - Aren M
Filters4Air News

Is it time to spring for new air filters?

Is it time to spring for new air filters?

Spring is just around the corner and you know what that means ...

Pollen!

And if you are living in San Antonio, you know that means OAK pollen -- lots of it -- everywhere! Expect your cars to have a new coat of yellow "paint" in a few weeks ...

... and also grasses, plants, shrubs, trees and flowers all getting their spring growth going and that means ‘sneeze’ in any language.

Now just imagine how much of that gunk is getting sucked into your AC system and into your home! And even if you aren't in San Antonio, spring is a tough time to be an air conditioner just about anywhere.

Make sure you enjoy your spring break by keeping your air clear and staying healthy. Set up a monthly subscription and let us worry about getting you a new filter. Remember that Filters4Air filters are manufactured in the U.S.A.

Ready to go? Then make your first order!

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