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


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Only $22.98 per
$68.95 ea
FF4M8 Sizes :
$68.95 Retail:$89.99
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Ships in 1 to 2 business days.

The Filters Fast® 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.

Filters Fast® 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 Filters Fast® FF4M8 3-Pack 4" Air Filter is available in the following sizes:

Nominal Size Actual Size Alternate Part Number
12x24x4 Air Filter 11.375x23.375x3.625 PF8.0412243PFF
16x20x4 Air Filter 15.375x19.375x3.625 PF8.0416203PFF
16x25x4 Air Filter 15.375x24.375x3.625 PF8.0416253PFF
18x24x4 Air Filter 17.375x23.375x3.625 PF8.0418243PFF
20x20x4 Air Filter 19.375x19.375x3.625 PF8.0420203PFF
20x24x4 Air Filter 19.375x23.375x3.625 PF8.0420243PFF
20x25x4 Air Filter 19.375x24.375x3.625 PF8.0420253PFF
24x24x4 Air Filter 23.375x23.375x3.625 PF8.0424243PFF
25x29x4 Air Filter 24.375x28.375x3.625 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

Compatible Models:

The MERV 8 Filters Fast® 4" AC and Furnace Air Filters 3-pack is correct replacement for the following model numbers:

BrandModel NumberDescription
GeneralAireGeneralAire 5FM2025Air Cleaner filter media
GeneralAireGeneralAire MAC2000Air Cleaner filter media
GeneralAireTrion 255649-102Air Cleaner filter media
No results for {X}


Customer Reviews:

Total Reviews: 32 | Average Rating: 4.5 / 5.0

constance Kiefiuk2022-11-06

great value for the price and fast delivery.

Collected by
Norman Pieschalski2022-11-05

So far so good. But I'm waiting for the cold weather to determine quality. More to come.

Collected by

The quality of the product is good as is the price.

Collected by
New customer2022-08-11

I have a large openning on my HVAC and so need the 4inch size. MERV 8 work great to filter the air.

Collected by
New customer2022-05-06

First is that these fit my air filter space; second is that they are great for the desert climate I live in, filtering out a great deal of dust and particles. They also came promptly when ordered.

Collected by
Sandra Pankratz2022-03-30

Seems like a fairly high quality filter at a decent price.

Collected by

Misrepresented; product is undersized and doesn’t meet specs for dimensions

Collected by

Quality is as good or better than the A/C (HVAC) filters I was purchasing locally.

Collected by
Paul B.2022-02-10

The filters are undersized and allow too much air to flow around them

Collected by
Amy D2022-02-08


Collected by
customerDave weber2022-01-29

not the same fit as bought at the store

Collected by

Good filter

Collected by
Rob Frazier2022-01-07

Rght fit for my furnace.

Collected by
Larry Lengle2022-01-02

I ordered furnace filters 16 X 24 X 4. That is what is indicated b the printing on the outside of the box they came in. However, when I opened the box, the filters were 15 1/2 X 24 1/2 X 3 5/8, which leaves gaps around the filter (between the filter and the slot). I called to complain and was told if I wanted filters to the exact measurement, I would have to have them custom-made. I called FILTRETE and they supplied filters of the exact size.

Collected by

Love filters fast. Great quality and great service.

Collected by

Ordered n came right away price not bad either

Collected by

A simple and streamline process.

Collected by
Joann H.2021-12-06

Great company!Stands behind their products.

Collected by
Martin Kraft2021-11-29

None today

Collected by

Good product for the money

Collected by

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