Spirotherm, Inc. offers the high-efficiency Spirovent® air eliminator for residential, commercial and industrial hydronic heating and cooling systems. Available from 3/4" through 36" pipe sizes and flows up to 30,500 gpm, the Spirovent air eliminator scrubs out all free air, all entrained air, and up to 99.6% of the dissolved air in the system to reduce the risk of corrosion and eliminate the need for labor-intensive manual bleeding. Spirotherm, Inc. Circle 1.