Frequently Asked Questions
What is a "MERV" rating?
MERV stands for minimum efficiency reporting value. MERV ratings are an air filter industry standard. The higher the MERV rating, the more particles are captured as well as the ability to filter smaller and smaller particles. While higher MERV ratings are better at filtering, air flow is reduced slightly. Residential furnace filters range from MERV 8 to 13.
How do I measure my air filter?
Measuring your air filter is easier than you think. One of the best ways to find the size of your air filter, is to check the outside of the filter to find the part number and size. On the outer frame, you will see at least one set of numbers. If you see two sets of numbers, the filter size needed to order replacements is the nominal size, not the actual size. You can ignore the actual size printed on your filter for this task, as the nominal size is the number set needed to order new filters. The other way to find the size of your filter is to measure it yourself. The measurements of the air filter go by length, width and depth. It’s also important to know that the length and width are interchangeable. For example, if your filter is 14 X 20 X 1, it can also be 20 X 14 X 1.