Originally Posted By: tgardner
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I inspected a new construction house today and found one 1.5" Roof vent stack for 14 fixtures located all through this house. One Horizontal run was 50’ with a 1" sag in the middle.
Noticed sewergas smell ![aiwebs_029.gif](upload://tNpCbl48ZXBnsDDqeJMAwzFMJz.gif) when draining lav fixture furthest away from the vent.
Is the vent undersized?