How Do I Know Which Size Air Filter I Need?Updated 2 months ago

When you want to determine the size of the air filter your HVAC system uses, check your existing one for the dimensions printed on its frame. Ask an HVAC professional for assistance or to measure the slot if you don't have the filter you were previously using. The measurements may also be included in your HVAC system manual. Before purchasing a replacement filter, verify the width, height, and thickness to make sure you’re getting the one that fits so your HVAC system will work correctly.