View our standard size list, which includes our nominal and actual sizes. Put the measurements together - l x w x dĪctual Size: 19-1/2" x 23-1/2" x 3/4" → nominal size: 20" x 24" x 1" round your measurements to the nearest whole number. this is also known as the thickness of the filter. Filterbuy 20x25x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.50 x 24.50 x 0.75 Inches) 35.32 35. round your measurements to the nearest whole or half number. Filters & Health Nominal vs Actual Size Silent Killers Blog Follow Us. 3M Filters 3M Filtrete Filters Air Bear Filters. the smaller size of the two is the length of the filter. 4' Air Filters 6' Air Filters 1/2' Air Filters Custom Sizes Filters Shop By Brand. Use a measuring tape to measure the length (l) & width (w). The nominal size is what you typically use when shopping for a replacement filter. Nominal Size- is the actual size rounded up or down to the nearest whole or half number. This is also described as the filter’s “undercut”. Nominal SizeĪctual Size- is the exact dimensions of your filter, often shown in precise fractions and is usually 1/2” – 3/4” less than the nominal size. If your filter doesn’t have a size printed on it or if you don’t have a filter to reference you can follow the simple steps below to measure your existing air filter or air intake (where the filter is placed when in use). Usually, there is a ‘nominal’ size that is printed in a large font and an ‘actual’ size printed in a smaller font on the frame. Most filters come labeled with two L X W X D sizes printed on the frame. Standard filters are 1 thick and Deep Pleat filters are either 2, 4, 4 slim fit, 5 or 6. If your HVAC system already has a filter being used check the filter for any printed sizing information. Using a filter that is too large or too small could result in air flowing around the filter (air bypass), resulting in unfiltered air recirculating into your home or office. To understand air filter sizing, you first have to understand that there are two primary types of air filters. Filterbuy 21x24.5x5 Air Filter MERV 8 Dust Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement for Rheem, Ruud, and Protech (Actual Size: 20.63 x 24. ![]() Finding the correct size filter for your HVAC unit is essential to properly capture airborne contaminants and keeping your system running smoothly. Filterbuy 18x18x1 Air Filter MERV 8 Dust Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 0.75 Inches) dummy.
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