Lennox 15M20 SPST Pressure Switch
The Lennox 15M20 SPST Pressure Switch is a safety control device designed to monitor air pressure in HVAC heating systems. It operates as a single-pole, single-throw switch that opens or closes an electrical circuit when preset pressure levels are reached. Commonly used in gas furnaces and induced-draft heating equipment, this switch verifies proper airflow and venting before allowing burner operation. Its reliable design enhances system safety, prevents unsafe operating conditions, reduces equipment damage, and supports consistent, efficient heating performance.