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MERV 8 FiltersFast 4" AC and Furnace Air Filters 3-pack


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Only $19.98 per filter
Retail: $69.99 /ea
You Save: 14%
As low as
Retail: $69.99
You Save: 14%

FF4M8 Sizes :

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Product Information

The FiltersFast FF4M8 3-Pack is a set of MERV 8 filters that effectively reduces contaminants from your indoor air. Removing these airborne particles can help improve allergies and alleviate sinus irritation that can cause watery eyes, itchy throat, coughing, and sneezing. The MERV 8 filter media is electrostatically charged and constructed with spun micro-fiber that also will not retain moisture, which can lead to microbial growth. Aside from the health benefits, these HVAC filters will also extend the life of your heating and cooling system by making it work more efficiently.

FiltersFast FF4M8 3-Pack Filter Specifications:

  • Part Number: FF4M8
  • Pack Size: 3 Filters
  • MERV Rating: 8
  • Filter Type: Electrostatic pleated
  • Material: Synthetic
  • Replace every 3 months
  • For commercial and residential use
  • Note: These filters do not contain fiberglass.

The FiltersFast FF4M8 3-Pack 4" Air Filter is available in the following sizes:

Nominal Size Actual Size Alternate Part Number
12x24x4 Air Filter 11-3/8 x 23-3/8 x 3-5/8 PF8.0412243PFF
16x20x4 Air Filter 15-1/2 x 19-1/2 x 3-5/8 PF8.0416203PFF
16x25x4 Air Filter 15-1/2 x 24-1/2 x 3-5/8 PF8.0416253PFF
18x24x4 Air Filter 17-3/8 x 23-3/8 x 3-5/8 PF8.0418243PFF
20x20x4 Air Filter 19-1/2 x 19-1/2 x 3-5/8 PF8.0420203PFF
20x24x4 Air Filter 19-3/8 x 23-3/8 x 3-5/8 PF8.0420243PFF
20x25x4 Air Filter 19-1/2 x 24-1/2 x 3-5/8 PF8.0420253PFF
24x24x4 Air Filter 23-3/8 x 23-3/8 x 3-5/8 PF8.0424243PFF
25x29x4 Air Filter 24-3/8 x 28-3/8 x 3-5/8 PF8.0425293PFF

NOTE: If you don't see your size, order a custom made air filter! Custom made air filters do not come individually wrapped. Please be advised that some larger filters require an additional cost (see dropdown window above).

Additional Resources:

For more information on air filter efficiency ratings, check out our resources below!


MERV Air Filter Chart


Customer Reviews:

Total Reviews: 4 | Average Rating: 4.2 / 5.0

I hope the next time that the HEPA filters gets sent, that they arrive at our address not one where we have to call in and help them find out what in the world happened to our order. They never suggested that it could have been sent to the wrong address, but when I asked them if they checked the address, they said no, checked it and it was the wrong address. Then she stopped pushing me saying that it was already sent to me. We value the products and the savings.

Collected by

Great product, will certainly do more business with this company!

Collected by

Excellent experience filters delivered on time & complete!

Collected by

These work for me, and are a very good value, but be sure they work for you. Actual measurement for the 16 x 25 x 4 filter is 15 1/2 x 24 1/2 x 3 9/16, which makes them very different in size than many other advertised 16 x 26 x 4, which it typically 15 3/4 x 24 3/4 x 4 3/8

Collected by