Lennox Ceiling Cassette Mini Split Replacement Filter — 21-1/4" x 22-1/4"

Keep your Lennox ceiling cassette mini split running clean and efficient with this direct-replacement air filter. Designed to fit select Lennox M33A and M33B series cassette indoor units, this filter maintains proper airflow, protects internal components, and supports air quality performance between service intervals. Filter Dimensions Length 21-1/4" Width 22-1/4" Compatible Lennox Ceiling Cassette Indoor Unit Models M33A024S4-1P M33A024S4-2P M33A036S4-1P M33A048S4-1P M33B048S4-1P Important Notes Verify filter dimensions against your existing filter before ordering — do not rely on model number alone Sold as a single filter Manufacturer warranty applies where applicable — see manufacturer documentation for details