This Filter Reduces: Dust/lint, pollen, pet danger, dust mite debris. Pollen + allergen particle reduction. Lasts up to 3 months. Air flow. Improving indoor air quality while optimizing HVAC performance Portafilter 2000 performance filters are designed to last up to 90 days. However, local air quality surrounding your home and the environment within your home can significantly alter the useful life of your filter. Pets, painting, construction projects, etc. Within the home reduce filter life. We recommend checking your filter every 30 days during moderate to heavy use of your HVAC system. Replace filters before they become completely covered with dust. This will prevent harmful back pressure on your HVAC system. Changing filters more frequently can also help to reduce energy costs. Purafilter 2000 filters outperform typical fiberglass filters. Always check your HVAC equipment manual to ensure this filter is compatible with your system. Inanimate. Limitation of Liability: PPA industries, inc. Will not be liable for any loss or damage arising from the use of this product whether direct, indirect, special, incidental, or consequential. All Merv data and statements are Indicative of typical properties and characteristics obtainable. Merv's claims are to be used as a guide for general comparison and not as a specification.