Lennox 21N39 Scale Insert 319852-301 Enables precise adjustment of the

Enables precise adjustment of the operating span and starting point when used with D-9502 positioners

Designed for high-reliability industrial and commercial refrigeration cycles

With a 13 Amp contact rating

Whether you are balancing an HVAC system or calibrating laboratory airflow

Lennox 21N39 Scale Insert 319852-301 Enables precise adjustment of theMaintain peak performance in humidification systems with the Lennox 21N39, a precision engineered scale control insert designed to manage mineral accumulation and ensure consistent evaporation rates. This OEM humidifier replacement part acts as the structural frame and pad holder for high capacity systems, effectively channeling water across the media while trapping scale before it can compromise internal components. Measuring 14 3 8" by 10", this