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Diameter
Length
Measuring Guide
The Filters Fast FFM136 reduces the following airborne contaminants:
Filters Fast 4-inch Air Filters (FFM136) have a MERV 13 rating and are useful in a variety of settings, including homes, offices, and industrial sites. The MERV (Minimum Efficiency Reporting value) rating explains the efficiency of your filter (a higher MERV rating means a more efficient filter). Standard fiberglass spun filters that you find locally oftentimes have MERV ratings of 1 or 2 and can lead to lower quality air flow at a higher cost. Not only will an air filter with a higher MERV rating increase the efficiency of your heating and cooling system, but you'll enjoy its benefits for a long time.
These MERV 13 filters effectively reduce pollen, dust, pet dander, mold spores, and dust mites, as well as bacteria, smoke, smog, and other allergens. The higher quality construction from these 4 inch filters benefits health and respiration, including alleviating problems with allergies and sinus irritation that might lead to itchy throat, watery eyes, coughing, and sneezing. 4 inch air filters are also more effective than thinner filters because their larger surface areas more much durable.
Filters Fast air filters are affordable without sacrificing quality. These HVAC air filters arrive in a variety of sizes to meet your air quality needs and are quite economical. Not to mention they are a cost effective upgrade from simple poly pleated or fiberglass filters.
FiltersFast FFM136 specifications:
The Filters Fast M13 Air Filters are available in the following sizes:
Nominal Size Actual Size
12X24X4 11 3/8 x 23 3/8 x 3 1/2
16x20X4 15 1/5 x 19 1/2 x 3 5/8
16X25X4 15 1/2 x 24 1/2 x 3 9/16
18X24X4 17 1/2 x 23 1/2 x 3 1/2
20X20X4 19 1/2 x 19 1/2 x 3 1/2
20X24X4 19 3/8 x 23 3/8 x 3 1/2
20X25X4 19 1/2 x 24 1/2 x 3 9/16
24X24X4 23 5/16 x 23 5/16 x 3 5/8
25X29X4 24 1/2 x 28 1/2 x 3 1/2
Don't see the size you need? Let us know, we can special order it for you! Email us at sales@filtersfast.com or call us at 866-438-3458 M-F 9am-5pm EST.
Prices listed are for a 6-pack of filters. For most homes, this is a year's supply -- and at a GREAT value!
Please note that Filters Fast Air Filters sizes listed are nominal sizes. The actual size of the filter will be 0.5 inches smaller than indicated. For example, if you select a 25x25x1 air filter the actual size of the air filter you will receive will be 24.5 x 24.5 x 1. Listing nominal size instead of actual size is an industry standard for most air filter brands so if your current filter says 25x25x1 in most cases this will be a nominal size. In some older homes, and in other cases you may require the actual size. If you require the actual size you will need to place a custom order with a representative. If you are unsure whether you need actual or nominal size simply measure your air filter before placing your order.
The chart below will show you what you can remove with a MERV 8 and MERV 11 air filter.
