We offer 14 x 20 x 1" filters in four different Minimum Efficiency Reporting Value (MERV) ratings: MERV 4, MERV 8, MERV 11 and MERV 13.

One of our MERV 8 rated filters is a replacement for the Lennox 91X23 filter. This six-month filter comes in a six-pack and works well for high-velocity equipment. It features a 30-gauge galvanized expanded metal grid and a moisture resistant double wall beverage board.

The MERV 13 rated filter will guard against lint and dust, dust mite debris, pollen, mold spores, auto emissions, smoke, pet dander, bacteria and tobacco smoke. You should change this filter every three months.

It is important to make sure you get the right size filter for your furnace. Shopping for filters online gives you the chance to compare a variety of different filters and find out what is best for you. The average consumer doesn’t usually realize there are a seemingly countless number of different materials a filter can be made of. Some of the more expensive materials include filters that are washable, or ones that filter bacteria and mold in addition to their normal function.