While the synchronous motor is designed for 24 VAC

F cut-in to prevent component damage due to overheating

this genuine HVAC replacement part ensures the protection of sensitive internal bimetal sensing elements while maintaining a clean

To maintain the integrity of the sealed combustion system and ensure safe operation

Is this a balanced port design

Armstrong International D41790 Air Vent 30067439-890 While the synchronous motor isThe Armstrong International D41790, also identified as the AV 13 brass air vent, is a specialized automatic air vent designed for hydronic heating systems and hot water service. Featuring a dual connection design with 1 2" female NPT and 3 4" male NPT ports, this float actuated valve effectively manages air binding by purging accumulated air during system operation. Constructed from high grade brass, the unit is rated for operating pressures up to 150