Are 4-inch or 1 inch furnace filters better?

A 4-inch air filter has a definite advantage over a 1-inch air filter in terms of longevity, airflow, and maximum filtering potential. Thus, if it fits your furnace, it will improve your home's air quality more than a 1-inch filter.

How long does a 4-inch thick furnace filter last?

A three to four-inch filter can last for six to nine months. If you have a thick five to six-inch filter, it can last from nine to twelve months. By making sure that your filters are changed when they need to be, you can enjoy having a heating and cooling system that will work its best.

How often do you change a 4-inch furnace filter?

A 4-inch air filter can last longer, filter more air, and accommodate your furnace more quickly than a 1-inch air filter. Thus, if it fits your furnace, you'll be able to improve your home's air quality more with a 4-inch filter than with a 1-inch filter.

What happens if air filter is too thick?

If you purchase a filter with too thick pleats, your filter will get dirty quickly. A suitable parameter to follow when considering MERV ratings is that if it's more than 13, the pleats are probably too thick for your needs.

Can I run my furnace without a filter for a few days?

Can I run my furnace without a filter? The answer is no. Don't get me wrong—you can run your furnace without a filter. It will operate just fine. But several potential consequences make this a bad idea: damage to your system, increased risk of health problems, and expenses down the road.

4" Furnace Filters

4" replacement furnace filters are available in many standard and non-standard sizes. Simply select your size from the drop down box below to choose your filter size. Keep in mind that length and width are reversible (i.e. a 15x20x4 is the same as a 20x15x4).