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Vents

Mattv_2
Member Posts: 12
I have Ventrite at the ends of each of my mains and I want to switch to gordons. The total length of one of mains is 38ft with 1 1/2" pipes and the returns are 1/2". The other is 35ft with 1 1/2" pipes and the returns are 1/2". I think this is what is needed to figure what size vents I need. Hope somebody can help.
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