this ASME Section IV certified valve is factory-set to 150 PSI

Industrial Build Quality: Utilizes ball bearings and a totally enclosed air over design to protect internal components from moisture and debris

as well as NTH-750 and NTH-850 series

while the coil voltage is 24V for the control circuit

Tjernlund Products D-3 Draft Inducer 323269-701 this ASME Section IV certifiedThe Tjernlund D 3 Draft Inducer is a critical inline draft inducer engineered to resolve persistent venting issues in gas and oil fired furnaces and boilers. Operating at 115V with a motor speed of 1550 RPM, this sidewall vent blower is designed for 3 inch vent pipes and provides consistent negative pressure to overcome restricted flues or poor natural drafts. Built for durability, the D 3 inducer features a heavy duty motor and high temperature