Posted by Harold Kestenholz - Hydronic Network on December 23, 2000 at 21:33:32:
In Reply to: main vents posted by dan d. on December 23, 2000 at 19:32:48:
From
http://fhs.ittind.com/literature/MISCELIT/Fhd-207.pdf
Page 3
Most but the smallest systems use a Hoffman 75.