ZoneFirst SPRD-12X8 Damper Els PW 17895 If the switch remains open

If the switch remains open despite normal airflow

ensuring the exact capacitance required by factory specifications

this propeller fan ensures direct compatibility with standard York

precisely calibrated to detect the proper draft within the combustion chamber before allowing the ignition process to proceed

Common Questions What is the difference between a thermocouple and a thermopile

ZoneFirst SPRD-12X8 Damper Els PW 17895 If the switch remains openThe ZoneFirst SPRD 12X8 is a professional grade barometric static pressure regulating damper designed to maintain optimal bypass airflow in multi zone HVAC systems. As the direct replacement for the PRD 12X8, this 12" wide by 8" high rectangular unit utilizes a counter balanced weighted arm to automatically bleed off excess static pressure when zone dampers close. This critical function prevents high velocity air noise, protects the heat exchanger