This is a genuine, OEM Lennox Healthy Climate X6670 air filter designed to work with any HVAC system. The HCF16-11 provides effective filtration to make any home's air healthier. Unlike many other whole home air cleaners, it doesn't add to the cost of running the heating and cooling system. MERV 11 media filter (MERV 11*/CADR 520**). Removes up to 85% of particles down to 3 microns*** *MERV = Minimum Efficiency Reporting Value. Describes the filter's ability to capture particles and ranges from 1 to 16. Typical fiberglass filter = MERV 1. The higher the MERV rating, the better the filtration **The Clean Air Delivery Rate (CADR) represents the cubic feet of clean air produced per minute ***One micron = 1/25,000 of an inch in diameter