The Filtrete Dust Reduction Filter attracts and captures particles such as dust, lint, and dust mite debris in your air. For optimum performance, the filter should be changed every 90 days. For Filtrete MPR 300 Basic Dust & Lint Air Filter, made by 3M, helps capture unwanted particles from your household air to contribute to a cleaner, fresher home environment. Made with exclusive Filtrete 3-in-1 technology, including an MPR 300 and MERV 5 rating, your AC filter will help pull and capture lint, household dust and dust mite debris, while letting cleaner air flow through. Use a 3-month pleated 1-inch home HVAC filter in your furnace, air conditioner or HVAC system. For optimal performance, change your furnace filter at least every 90 days.