Actual size: 19.5 x 22.5 x 0.75 inches
Pleated air filters suitable for furnaces, ACs and residential HVAC systems
MERV 11 filters remove up to 95% of common particles including fine dust, smoke, and smog particles. These filters reduce allergy symptoms and protect against outdoor air pollution.
Processed quickly, ships fast, free for all orders
Premium quality products crafted right here at home
Return your items within 30 days and get a full refund
Find your perfect fit with our complete size range
MERV 11 air filters are designed for homes with allergies and in some cases, asthma. Those with respiratory illnesses or compromised immune systems may benefit from MERV 11 air filters due to these filters being significantly more powerful than alternative MERV filters at capturing smaller particles, such as MERV 8.
Scroll right to see more
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 20x23x1 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
For best indoor air quality, we recommend you change your filters regularly at different times depending on your situation.
Replace your air filter every 6 weeks to minimize the circulation of bacteria and allergens in the air.
Replace air filters every 2 months to reduce odors as well as pet dander and hair buildup in your system.
Replace your air filter every 2-3 months to reduce airborne particles and maintain cleaner indoor air.
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 20x23x1 air filter is 19.5x22.5x0.75 inches. Our filters are half an inch smaller than the nominal size to ensure they fit perfectly into the slot.
You should replace your 20x23x1 air filter every 30 to 90 days. Homes with pets, indoor smokers, or allergy sufferers may need to replace their filters more frequently.
No, most 20x23x1 pleated filters cannot be washed and reused. These filters are designed to be disposable and should be discarded upon replacement. Any attempt to wash a disposable filter will destroy its fibers and render it ineffective.
A MERV 13 20x23x1 filter may restrict airflow in older or lower-capacity HVAC systems. Restricted airflow can lead to uneven heating and cooling, increased energy bills, and premature component wear and tear. Consult your HVAC manual to determine system compatibility.
Yes, whether it's labeled 20x23x1 or 20x23, it's the same air filter. The x1 confirms a 1-inch filter thickness, but this is already implied by the standard 20x23 description.
No, you should never stack 20x23x1 filters together to improve filtration. Stacking filters restricts airflow, which can cause your HVAC system to run longer to heat or cool your property. This can result in increased utility bills and accelerated wear and tear on your unit.
If your 20x23x1 filter dirties quickly, it's likely because of household and/or environmental air conditions. High volumes of dust, pet dander, lint, debris, and other airborne particles can cause a filter to dirty faster than normal. Environmental pollutants and high pollen counts can also accelerate filter dirtying.
No, using a 20x24x1 filter rather than a 20x23x1 is not recommended. This is because a 20x24x1 is larger and will likely not fit perfectly into the slot. This can result in a tighter fit and reduced airflow, impacting system efficiency. Only use the air filter size that your HVAC unit is designed to handle.
MERV 8 filters