18x20x4 Merv 11 Furnace Air Filter

Code: 18204M11

Actual Size:17 1/2 x 19 1/2 x 3 3/4

  • Extends life of HVAC Equipment
  • Protects HVAC Equipment
  • Top Quality
  • All Filters are made to order, please allow up to 7 days for processing.
  • Color of filter may vary from picture




Merv Filters LLC specializes in providing high-quality 18X20X4 Merv 11 filters that will not just help you to improve the indoor air quality but also extend the life of your heating and cooling system. Our 18X20X4 size Merv 11 rating air filters are highly-efficient in removing 65% to 79% particles of 1.0 to 3.0 microns and more than 85% particles of 3.0 to 10.0 microns.

18X20X4 Merv 11 filters from Merv Filters LLC are designed to capture dust, pet dander, mold spores, bacteria, and more. Eliminating these airborne particles can help to prevent yourself and your family from several infections and allergies.

Usually, these Merv 11 filters come with a life span of 90 days. But if you are residing in an area which is prone to dust storms, consider replacing your air filter every 2 months. Our 18X20X4 Merv 11 furnace filters are a cost-effective method for upgrading your air quality at a low-pressure drop.

Important Note: Be careful while selecting the filter size. Our 18X20X4 Merv 11 filters are delivered throughout the USA according to the nominal filter size, which is a fraction of an inch bigger than the actual size of the filter. Like, if the ‘nominal’ size of this air filter is 18x20x4, the ‘actual’ size will be 17.5×19.5×3.75.

Additional information

Weight 0.50 oz


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