Filtrete filters are designed to efficiently function in virtually all residential heating, cooling and ventilation systems where filtration is needed. These highly efficient filters clear circulating air of large quantities of contaminants. Their regular working lifespan should be no longer than three months.

3M's Filtrete design combines a higher density of filtration media in much tighter pleats than most other brands of discount filters. This increases the filter's functional surface area and its capacity to capture particulates that can cause respiratory distress in asthmatics and allergy suffers. This design makes Filtrete one of the most effective discount filters on the market comparatively.

Unlike most filters, 3M does not use the Minimum Efficiency Reporting Value (MERV) rating system that is the accepted standard used by most other filter manufacturers. Instead, 3M defines the capabilities of its Filtrete brand with its own proprietary Microparticle Perfomance Rating (MPR) system. Discount Filtrete filters meet the American Lung Association's Health House (R) Indoor Air Quality Guidelines. The Dust & Pollen model is rated 600 MPR, which is roughly the equivalent of a MERV 8 filter. The Elite Allergen is rated 2200 MPR according to 3M's scale and this is roughly equivalent to a MERV 13 filter by other manufacturers. Filtrete filters have high capacity to capture particles before they become an environmental hazard within the home. They are ideal for people who have concerns about airborne particulates that can exacerbate respiratory conditions.

Because Filtrete filters are electrostatically charged to attract particles, construction and renovation projects can produce extra visible and invisible debris that will be drawn to these filters and cause them to clog more quickly than otherwise. Regular inspection of these filters is highly recommended since clogged filters can restrict the flow of air coming from a furnace or air conditioner and cause damage to the system's inner workings.

Purchasers of discount Filtrete filters can realize savings of $25.00 or more on a six-pack, enough for more than a year. Free shipping is routine. All discount filters should be returned in the same condition as received and with the original packaging, within one year of the date of purchase if needed.