Zonefirst SPS Pressure Switch 30067439-890 it handles thermal expansion and

it handles thermal expansion and pressure fluctuations with ease

verifying correct drafting before the ignition sequence initiates

OEM Compatibility: Engineered as the specific NS2-1020-01 replacement to maintain UL listings and safety certifications

this kit ensures the mechanical linkage remains responsive to current velocity requirements

53" WC to meet specific OEM air-proving requirements

Zonefirst SPS Pressure Switch 30067439-890 it handles thermal expansion andThe Zonefirst SPS is a ruggedized dual static pressure switch designed for contractors who need precise modulating control over HVAC bypass dampers. Engineered with two fixed factory settings of 0. 2" WC and 0. 3" WC, this unit integrates seamlessly with RDM and ZDM dampers to manage bypass air without the need for complex field calibration. Its SPST snap acting electronic switches ensure a definitive response: the damper powers open above 0. 3" WC