Zonefirst SPRD-9 Damper Els PW 17895 if the application requires a

if the application requires a shorter insertion depth

For technicians troubleshooting a lockout

from 100 to 400 models

for older systems with mineral oil

For liquid propane applications

Zonefirst SPRD-9 Damper Els PW 17895 if the application requires aThe Zonefirst SPRD 9 is a professional grade 9 inch round barometric static pressure regulating damper engineered for precise HVAC bypass management in multi zone systems. This mechanical, non electrical component utilizes a weighted counter balance arm to automatically relieve excessive static pressure as individual zone dampers close. When the air pressure in the supply plenum exceeds your calibrated setpoint, the damper blade opens to bypass air