The SPC is a higher pressure control for a modulating damper to control by-pass air. The SPC is adjustable between 0.08 in WC to 0.8 in WC and modulates the RDM/ZDM dampers to maintain the system static.
Recommended for any system over 7 tons|-40 to 190 deg F operating|1 A at 24 VAC
Zonefirst Static Pressure Control, 0.08 to 0.8 in WC Control Range, 1/4 in Flexible Tubing, Domestic