For most 15 PSI systems

dry air supply to prevent orifice fouling

Durable Construction: Features stainless steel and high-quality elastomers designed to withstand aggressive water conditions and thermal expansion

It will not function correctly in gravity-fed or zero-pressure systems

this non-asbestos gasket ensures a leak-proof seal under the rigorous thermal cycling common in pilot-operated steam regulators

Lennox 97J65 Limit Switch 320735-701 For most 15 PSI systemsThe Lennox 97J65 Limit Switch is a critical safety component designed for precise thermal regulation within Lennox residential furnace units. Featuring a 150 180F AUTO temperature range, this primary limit control monitors heat exchanger temperatures to prevent thermal runaway. When the internal plenum temperature reaches the 180F cutout point, the switch opens the circuit to the gas valve, shutting down combustion while allowing the blower motor to