Product Information: The automatic air vent is a pressure safety mechanism in the central heating unit. They work by using floatation to release an accumulation of air. As water flows through the heating/cooling system, a float within the automatic air vent opens or closes depending on the water level. If the system is full of water, the float will be pushed to the top and the vent will be closed until the water level drops.
This part is present in 16 different boilers in the Biasi range including the Biasi PARVA SE M90.24S , PARVA SE M90.28S , PARVA SE M90.24SR , PARVA SE M90.28SR , RIVA COMPACT M90E.24S .