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Best Furnace Filter - Best Air Purifier

Choice of a furnace filter or an air purifier is more important than the choice of the furnace itself. A good (5 inch wide) furnace air filter has large surface that can catch a lot of dust without restricting the airflow. Bad furnace air filter (1 inch wide) can ruin the best furnace and the air conditioner. With a good furnace filter even entry level furnaces will last and last.

5 inch furnace filter 

Proper Furnace Filter

5 inch Furnace Filter Is the Best Furnace Air Filter


5 inch wide furnace filter will pay for itself in no time by reducing resistance to air flow. You will

Bad Furnace Filter

Avoid 1 inch Furnace Filters

Furnace Air Purifier

Lennox PureAir 

In some situations, like allergies, homeowners install air purifiers (furnace filters) using advanced features. The success depends on the source of allergies.  For example, if the source is a cat, no filter will help. 

Lennox PureAir – air purification system has an exclusive UVA-light technology to destroy all three classes of particles:

Purifies the air in the house better than any other single system you can buy. PureAir, unlike other Electronic Air Cleaners, does not only create ozone but also destroys ozone gas (O3). 

PureAir™ is a whole-home solution that means cleaner air in every room.

Details About PureAir at Lennox

Hepa Air Purifier for Home

In some homes, filter HEPA type was used in the past before 5 inch filters came to the market. As you can see from the picture, the HEPA air filter diverts only a part of the air flow, usually 1/4. Only that part of the air flow goes through the hepa air purifier and gets cleaned.

These days we have 5 inch furnace air filter that does exactly the same job as HEPA furnace filter but for the entire air flow, not just 1/4 of it. Also, it eliminates a restrictive 1 inch filter. All this makes use of HEPA air purifier for home obsolete.

Once again, for anything that HEPA furnace filter is trying to do for a part of air we have a whole house furnace filter that does the same for the entire air flow.

Hepa Air Purifier

Hepa Air Purifier for Home