and Virus carrying particles. Like all 3M Filtrete filters, the Ultra Allergen filter lasts for 3 months, and is electrostatically charged, which helps it to attract even the smallest particles without restricting the airflow in your system.  (less)

spores and pet dander  (less)

and viruses are so tiny they can remain airborne for days, just waiting for you to walk by and take a nice deep breath. The good news is that the Filtrete Ultra Allergen filter does a great job of snatching bacteria and viruses right out of the air, so grab a 6-pack and at least you'll have a fighting chance.  (less)

Carry Viruses, Meets The Guidelines Of The American Lung Association Health House Program.  (less)

a magnet, attracting and holding more particulates to the filter than conventional filters can. Allergens such as pet dander, mold spores, dust, smoke, and smog particles can be captured with this filter. The filtering material is designed to not support the growth of bacteria, mold, mildew or fungi. ::Highlights:::The ultimate filter for allergy sufferers :Outperforms by 25% all other 1" filters :15% better airflow than Red Filtrete :Lasts 3 months :1250 performance rating :Mini-pleats for ultimate particle retention :Shrinkwrapped :20" x 25"  (less)

filter per package :Shrinkwrapped :18" x 18" x 1" Regional retailer request.  (less)

dust-large particles :The ultimate filter for allergy sufferers :Outperforms by 25% all other 1" filters :15% better airflow than Red Filtrete :Lasts 3 months :1250 performance rating :Mini-pleats for ultimate particle retention :Meets the American Lung Association Health House Indoor Air Quality Guidelines :No unnecessary antimicrobial chemicals added; Filtrete filtering material will not support the growth of bacteria, mold, mildew or fungi in normal use :Shrinkwrapped :18" x 24" x 1"  (less)

Carry Viruses, Meets The Guidelines Of The American Lung Association Health House Program.  (less)

conditioner filters. ::Shrinkwrapped 14" x 20" x 1" ::Red label ::Each provides 3 months of protection under normal conditions  (less)

::Meets the American Lung Association ::Health House Indoor Air Quality Guidelines ::3M - 1000 Microparticle Performance Rating, MERV 11 ::No unnecessary antimicrobial chemicals added; Filtrete filtering material will not support the growth of bacteria, mold, mildew or fungi in normal use ::Removes 92% of air-borne dust, pollen and mold ::Shrinkwrapped 16" x 30" x 1"  (less)

:1 filter per package. :Shrinkwrapped. :22" x 22" x 1".  (less)

Microparticle Performance Rating, MERV 11 :Filtrete filtering material will not support the growth of bacteria, mold, mildew or fungi in normal use :Shrinkwrapped 18" x 24" x 1"  (less)

Carry Viruses, Meets The Guidelines Of The American Lung Association Health House Program.  (less)

:1 filter per package :Shrinkwrapped :20" x 24" x 1"  (less)

your cake and eating it too... the Micro Allergen goes to work every time your heating and cooling system kicks on. It's like having an expensive whole house air purifier, only cheaper!  (less)