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Updated by Courtney Graley on Aug 12, 2015
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United Filter

To choose a replacement filter you will need to know the size, and or manufacturer. Apart from our unique ability to satisfy customers with their special filter needs, all filters are easily found on this site. Simply search by size, brand or merv rating.

How To Choose the Right Furnace Filter For Better Indoor Air Quality?

As far as home improvement goes, furnace filters are definitely way down on the excitement ladder. There's no real proud moment, or sense of accomplishment after having changed the filter. Yep - it\'s quite mundane and downright boring.

How To Choose the Right Furnace Filter For Better Indoor Air Quality?

As far as home improvement goes, furnace filters are definitely way down on the excitement ladder. There's no real proud moment, or sense of accomplishment after having changed the filter. Yep - it\'s quite mundane and downright boring.

OEM (Original Equipment Manufacturer) filters are the specific filter model marketed with the original equipment. Aftermarket products are created by a different company to the same specs as the OEM product. They are designed to fit and work the same as the original.

MERV Ratings: What You Need to Know

A MERV rating tells you, on a scale of 1-16, how effectively your filter traps the small particles you don't want circulating through your home. The higher a MERV rating, the higher the amount of particles the filter traps. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) established the ratings system in 1987.

Why Should I Worry about Indoor Pollution?

When you think of air pollution, you likely picture smog settling in above the world's biggest cities. You may think of smoke stacks and dust churned about in streets from millions on their way to and from work, school and everything in between.