Air Eliminator Sizing

Air Eliminators remove air bubbles from hydronic heating systems before they can cause any disturbances. Normally, an air eliminator that matches the size of the supply and return piping will be installed. Most air eliminators, however, should really be sized based on the flow rate of the liquid in the system. 3/4” Spirovent air eliminators can handle up to 6 gallons per minute (GPM). 1” models are compatible with 10 GPM, and 1-1/4” range up to 15 GPM. Requirements differ by manufacturer and water velocity.