Knowledgebase
Air Filter Sizing
Posted by Ty Woods on 29 February 2012 09:30 AM

Please Check Exact Measurement to Ensure Correct Air Filter Sizing –

Your air conditioner furnace filters size is measured by the width x length x thickness in inches. For example, a pleated air filter that is 20x25x1 means 20 inches wide by 25 inches long by 1 inch thick. Most residential air conditioner furnace filters are 1” thick. The actual measurements of each air conditioner furnace filters are usually about half an inch less than the listed size. The actual size of our 20x25x1” air conditioner furnace filter is 19 ½ x 24 ½ x ¾”. This is normal. Most air conditioner furnace filters have the size printed on them, so you just have to find your existing air conditioner furnace filters. Sometimes homes have 2 or 3 different sizes of air conditioner furnace filters in various locations in your home. Again, consult your HVAC system’s operating manual for information. Our filters may vary up to 1/8 of an inch due to the nature of the filter manufacturing process.

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