Actual size: 19.68 x 19.93 x 4.37 inches
Deep pleated air filters for whole-house and commercial 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.
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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.
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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 20x20x5 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.
No. Never combine the use of two thin filters in your media cabinet. It's always best to upgrade to a new air filter with thicker media, such as a 5-inch filter, whenever possible (and compatible). Two 1-inch air filter solutions will not match the 5-inch media's surface area, cabinet fit, or seal. You will also increase bypass risk and pressure drop without the extended dust-holding capacity benefits. Always use a single 20x20x5 air filter solution in a proper media cabinet for the best performance possible.
It may help reduce energy bills due to consistent airflow and less restriction than a dirty 1-inch filter, resulting in less strain overall on your HVAC system. Deeper media provides more surface area and a lower average pressure drop as it loads, which ultimately helps reduce blower strain. Starting with MERV 8 or MERV 11 is recommended if you're unsure which air filter is right for your system or if you do not have a high-efficiency system designed for MERV 13 air filter solutions.
Yes! Installing a new air filter is a breeze once you're familiar with the process. Once your HVAC system has been powered off, you can simply open your media cabinet door and slide out the existing air filter. This is the perfect time to take note of the direction of the printed arrows and exact size of your air filter to ensure you've found the right replacement. If your cabinet will not close or seal with your new air filter, it may be best to verify your system requirements (using a manual or guide), or by working with a professional.
Yes, a 20x20 (5-inch) air filter will help reduce dust from settling by capturing more airborne particles. Deeper media means the ability to hold more dust while allowing performance to remain steadier in between replacement cycles. The right air filter can make all the difference.
Installing any air filter backwards can result in reduced filtration efficiency and, in some instances, it can even damage the filter itself. Choosing the right air filter is imperative as a homeowner. The wrong air filter may also reduce particle capture. Always match the airflow arrow to the blower direction when you're installing a new air filter. The wrong filter may damage your system, which is why it's essential to know which filters are proper for your HVAC setup.
Generic air filter solutions may vary significantly in quality, pleat count, and MERV performance. Inconsistent dimensions can also impact cabinet sealing and efficiency. Look for tested MERV 8, 11, 13, and MERV 8 Carbon ratings.
Yes, 20x20x5 MERV 13 filters help reduce wildfire smoke particles indoors. Public health guidance favors MERV 13 during smoke events. Keep doors and windows closed during peak seasons for the best results and steady airflow.
No. It is never recommended to wash or manually clean filters, even when wet. Pleated filters are not washable. Washing the media can damage the air filter and result in warped pleats while promoting microbial growth. If a filter gets wet, it's essential to replace it immediately to protect your HVAC system.
Remove the used air filter and place it into a proper bin or bag. Avoid shaking the filter to remove dust buildup and instead, opt for a replacement filter.
MERV 8 filters