How to Find the Perfect Air Filter Size for Your Home

When it comes to air conditioner filters, size matters. The right size filter will ensure that your home is properly ventilated and that your HVAC system is running efficiently. But how do you know what size air filter you need?The filters are labeled with three-part dimensions. The first number is its length, the second is its width and the third is its depth or thickness.

To get the nominal filter size, round these measurements to the nearest inch. This is the measurement you'll use when buying a replacement air filter. Most people won't be able to find the size air filter they need at the local home improvement store. Many air conditioning and HVAC units use standard size filters, but some require a custom-sized air filter to be purchased and installed. To find the perfect air filter, you'll need to know how to measure an air filter and understand that the dimensions you see may not be the actual size. If your HVAC system uses a whole house filter (they're close to the central furnace or air conditioning unit), the model number will most likely appear, not the dimensions.

If an oversized filter gets stuck where it doesn't belong, it can damage the HVAC system and not clean the air properly. The filter should be slightly smaller on each side of the slot in the filter housing, allowing you to slide the filter in and out with ease. Regulated, improperly sized, or installed filter frames can cause air leaks, significantly reducing filter efficiency. If the dimensions are too discolored to read or there's no air filter to look at, it's time to measure it yourself. Measuring an air filter is easy. All you need is a tape measure or ruler.

Measure the length, width, and depth of your existing air filter. Make sure to measure in inches and round up to the nearest inch for each measurement. Once you have these measurements, you can purchase a replacement air filter that fits your HVAC system. Finding the right size air filter for your home doesn't have to be difficult. With a few simple measurements and some basic knowledge of how to measure an air filter, you can find a replacement that fits your HVAC system perfectly.