• Nominal Size: 20 x 25 x 4, Actual Size: 19 1/2 x 24 1/2 x 3 5/8 (19.5 x 24.5 x 3.63)

• Measure your air filter for the exact size and compare it to our actual size to ensure proper fit.

• Made with MERV rated synthetic poly blend pleated media

• Nordic Pure recommends changing 4" air filters every 3-6 months

• Nordic Pure MERV 12 is equivalent to MPR 1500-1900

• Made in the USA.

Important Note:  Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" - and then you can be sure your A/C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. If you are replacing a 4 3/8 depth 20x25x4 filter in your Honeywell unit you should order our 20x25x5 Honeywell Replacement air filter that measures 19 7/8 x 24 7/8 x 4 3/8 (19.63x24.88x4.38).

Nordic Pure 20x25x4 Pleated Air Filters MERV 12 are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, smoke particles, virus carriers, bacteria, allergens, mold spores and other contaminants are removed. All Nordic Pure pleated air filters are manufactured using a heavy duty, moisture resistant beverage board frame. There is a metal mesh support grid bonded to the pleats for extra support. Our AC filter media prevents the growth of bacteria or mold, resulting in a much healthier living environment.

MERV 12 furnace air conditioner filters are comparable to HVAC filters with the rating of MPR 1500-1900. Particles in indoor air are measured in microns; for scale, a human hair is about 70 microns wide. Each Nordic Pure 4” MERV 12 air filter will capture more than 90% of 3.0-10.0 micron contaminants and up to 90% of 1.0-3.0 micron contaminants. This high-performance HVAC replacement filter will outperform non-electrostatic fiber-glass filters, washable filters, poly disposable filters, and will help keep your air conditioning and heating systems running efficiently, saving money on utilities and costly maintenance.

The effective life of your AC air filter depends on both the inside and outside conditions in which you live.  It is important to regularly change your furnace air conditioner filters especially during any home improvements for fresh, clean air in your home or office. We recommend that you change your air filter every 3-6 months to maintain maximum efficiency and economy.

FAQ- Frequently Asked Questions

Where are my air filters located?
Air conditioner and furnace filters in most homes are generally located behind an air intake grill in your home's walls, ceiling, basement or attic. These generally look like large vents, but the air flows into them, rather than out of them when the heating or cooling system is blowing air. They may also be located in or near the air conditioner or furnace. Many homes may have more than one, and they may be different sizes. Contact your heating or cooling professional if you can't find them.

How will my filters arrive?
Nordic Pure Filter's arrive in a specially designed box that can be reclosed to keep your extra filters clean. Your filters do not arrive individually wrapped in plastic. Our Nordic Pure box has been designed and tested with a High ECT rated material to ensure that our customers receive their filters intact and undamaged during transit. If they are damaged in transit, simply contact us and we will be happy to file a claim and get you another box of filters.

Where do I find the MERV rating of my filters?
In order to keep our prices competitive, we do not print the MERV rating on the filter frame. We manufacture and box one MERV rating at a time. When the filters are boxed the MERV rating will either be printed on the side of the box, or a color-coded MERV sticker will be on the side of the box. The product you ordered should also be listed at the bottom of the shipping label.

Which direction does my air filter face?
There is an airflow direction arrow on the side edge of your Nordic Pure pleated air filter. In the absence of the arrow for the pleated air filters the metal mesh is on the air exit side. For air filters with carbon added the carbon is on the air exit side. On the half inch air filters the smooth MERV material is on the air exit side.

I live in an apartment. Can I use Nordic Pure Air Filters?
Most apartments have air filters in each apartment that can be replaced by you. Contact your apartment maintenance staff for information on furnace filter locations, sizes and their requirements.