Actual size: 19.5 x 23.5 x 3.75 inches
Deep pleated air filters for whole-house and commercial HVAC systems
Odor Eliminator filters remove up to 90% of common particles plus cooking smells, pet odors, and chemical vapors. Activated carbon absorbs odor molecules that standard filters miss.
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MERV 8 Carbon filters are ideal for standard protection and odor removal in the home. If you're seeking odor elimination and want to do so with your HVAC filter, MERV 8 Carbon may be the ideal choice. They can effectively manage particles such as dust, lint, pollen, and some mold spores while also reducing smoke odors, cooking smells, and odors from pets with ease. With an added odor carbon layer (activated carbon layer), unwanted smells can easily be eliminated without upgrading to a higher filtration level.
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Check the label on your current filter or use a tape measure to get the exact length, width, and depth before selecting your size.
Nominal size
Nominal size is what you normally see printed on the label. This is usually a rounded size which is often not the true size of your filter.
Actual size
Actual size is the true size of the air filter, usually written in smaller font below the nominal size.
Measure your current air filter or the length, width, and depth of the opening slot to get the actual size. Round it up to the nearest whole inch to get the nominal size.
Installing 20x24x4 air filters couldn't be easier. Just make sure to align the arrow printed on the side with the airflow direction!
Remove the air filter from the package
Locate the arrow and point it in the direction of the fan
Slide the filter in to the slot of the central unit
For return grills, insert the filter into the grill, pointing the arrow inwards
Keeping your air filter replacement schedule in mind can be challenging to say the least. Make your life easier with Filter King's auto delivery.
The actual size of a 20x24x4 air filter is 19.5x23.5x3.75. The actual, or exact, size is always slightly smaller than the nominal size to ensure the filter fits easily into the media cabinet.
Only use a 20x25x4 filter if your HVAC system is designed to handle a thicker filter size. A 20x25x4 air filter is 1 inch larger than a 20x24x4 filter, so it won't fit into a slot designed for a 20x24x4 filter.
Replace your 20x24x4 air filter every 6 to 9 months, depending on your household's conditions. Pleated 4-inch-thick filters offer more surface area to capture contaminants and last longer than 1-inch filters. However, homes with pets, allergy sufferers, or in areas of poor environmental air quality will likely need to replace the filter more frequently.
A 20x24x4 MERV 13 air filter isn't likely to restrict airflow in modern, high-efficiency HVAC systems. However, you may notice weaker airflow in older systems that aren't designed to accommodate MERV 13 air filters.
Yes, you'll need an HVAC unit with a housing that's designed to accommodate a 20x24x4 air filter.
Vacuuming a 20x24x4 air filter to extend its life is not recommended. While vacuuming can remove surface debris, it cannot remove any particles that have become trapped in the filter's fiber. Moreover, vacuuming the filter can damage it and cause performance issues.
20x24x4 air filters are just as easy to install as a 1-inch filter. All filters are designed to slide easily into the housing, creating a snug seal without any gaps.
A 20x24x4 air filter can help household members with seasonal allergies if it has the right MERV rating. 20x24x4 MERV 13 filters are ideal for households with allergy sufferers, as they capture up to 98% of common particles. This includes dust mites, pollen, pet dander, lint, mold spores, fine dust, smoke particles, bacteria, and more.
MERV 8 filters