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Dole #4 and #5 main vents
Does anyone know the specs for a Dole #4 and a Dole #5 main vent?
ie. CFM at 1oz?
Comparing it to a Gorton #1, I'm guessing the #4 is about .25CFM and the #5 is about .50CFM
The Vanguard Company
Specializing in Commercial Steam and Hot Water Heating
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