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The FiltersFast FF4M11 3-Pack is a set of MERV 11 filters that effectively reduce pollen, dust, pet dander, mold spores, dust mites and other allergens from 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 11 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 FF4M11 3-Pack Filter Specifications:

• Part Number: FF4M11
• Pack Size: 3 Filters
• MERV Rating: 11
• Filter Type: Electrostatic pleated
• Material: Synthetic
• Replace every 3 months
• For commercial and residential use

The FiltersFast FF4M11 3-Pack 4" Air Filter is available in the following sizes:

         Nominal Size            Actual Size

• 12x24x4 Air Filter   11-3/8 x 23-3/8 x 3-1/2
• 16x20x4 Air Filter   15-1/2 x 19-1/2 x 3-1/2
• 16x25x4 Air Filter   15-3/8 x 24-3/8 x 3-5/8
• 18x24x4 Air Filter   17-1/2 x 23-1/2 x 3-1/2
• 20x20x4 Air Filter   19-1/2 x 19-1/2 x 3-1/2
• 20x25x4 Air Filter   19-3/8 x 24-3/8 x 3-5/8
• 24x24x4 Air Filter   23-5/16 x 23-5/16 x 3-5/8
• 25x29x4 Air Filter   24-1/2 x 28-1/2 x 3-1/2

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!

Product Reviews :

• 
  4 inch Filters
  prestondave  Wednesday, August 01, 2018
  
  I&#039 ve been purchasing 4 inch filters for some time. Fast Filters is FAST at very low cost. Their &#039 packaging&#039 for shipping leave a bit to be desired. Numerous times the filters arrived &#039 crushed&#039 on one end or the other from shipping. To their credit, they have responded by replacing the damaged filters.
  
  
• 
  Just Like the Expensove ones
  keith0391  Thursday, July 19, 2018
  
  Filters came fast and in good condition
  
  
• 
  excellent products and pricing
  oehlert_don  Wednesday, July 18, 2018
  
  I ordered these filters, and about 4 days later, they were on my doorstep! They fit well, they filter the air well, and are an excellent value for what you pay.
  
  
• 
  Excellent filters
  jskulp  Wednesday, July 18, 2018
  
  The filters are precisely sized, do an excellent filtering job and are long lasting. This is the second time I have ordered them from Filters Fast...
  
  
• 
  Exactly as expected
  thaylok  Wednesday, July 18, 2018
  
  I received my 3-pack of filters and they were just what i needed for my system at an afordable price which is about 1/2 of what i would have paid at lowes (the only big box store that carries that size filter in my town).
  
  
• 
  Just as the name said Filters Fast! A+
  amondson22  Wednesday, July 18, 2018
  
  I&#039 ll be a repeat shopper!
  
  
• 
  Great Filters
  melloway  Wednesday, July 18, 2018
  
  These are great and very reasonably priced filters. I’ve been using them for the past nine years.