OEM Lennox Air Filter — 97L87

The genuine OEM Lennox 97L87 air filter is engineered to fit your Lennox furnace or air handler exactly, trapping dust, pollen, and airborne particles before they reach the blower and coil. Clean filtration protects internal components, maintains rated airflow, and helps keep your indoor air healthy. Because it's a factory-spec part, the 97L87 seats properly in the cabinet with no bypass gaps that let unfiltered air slip through.

Common signs the filter needs replacing include reduced airflow from the vents, longer run times, dust building up on registers, and a musty smell when the system cycles. A clogged filter also raises static pressure, which can overheat the heat exchanger or freeze the evaporator coil over time.

Choosing an OEM Lennox filter matters because aftermarket sizes often fit loosely or restrict airflow more than the system was designed for, forcing the blower motor to work harder and shortening its life. The 97L87 delivers the correct dimensions, media density, and pressure drop Lennox specifies, protecting your equipment and preserving efficiency. Keep a spare on hand and replace regularly for reliable performance.