Do you know what size filter you need, but have no idea what MERV rating you need?

First of all, we should establish what a MERV rating actually means. MERV ratings are based on three composite, average removal efficiency points for particles it catches from the air. MERV numbers range from 1 (very low) to 16 (very high). Here’s an easy way to remember it: the higher the rating, the more efficient your air filter will be.

MERV 1 to 4 filters provide minimal filtration. These filters have to be replaced frequently and are typically made of disposable fiberglass or synthetic panel filters within a cardboard frame. These filters capture up to 80% of airborne particles as small as 10 microns (microns are a unit of length equal to one-millionth of a meter—basically those small particles in the air you can’t even see).

MERV 5 to 8 filters are great for capturing dust and mold spores. These filters have to be replaced every 3 months, in most homes. MERV 8 replacement air filters are ideal for reducing pollen, pet dander, dust and other contaminants as small as 3.0 microns.

MERV 9 to 12 furnace air filters are able to capture up to 95% of airborne particles and contaminants like pollen, dust mites and mold spores, as small as 1.0 microns. These filters are deep pleated, boxed media or bag filters, which make them some of the most efficient filters that can be used in homes and commercial buildings.

MERV 13 to 16 air filters will trap up to 98% of airborne allergens and pollutants such as bacteria, tobacco smoke, cooking oil and droplet nuclei, as small as 0.3 microns.

It’s important to find the best-rated air filters for your particular needs.

Don’t forget to change your air filter frequently to ensure that you and your family are breathing in the cleanest and healthiest air possible.