Oblong hub drain funnel, several lines dumping into hub, sanitary standard asks for 2 x diameter of largest inlet to hub funnel/drain for acceptable air gap. Currently the the largest inlet is 4 inch and air gap is currently 3 inches. There is room to cut out of front of funnels o increase air gap. What amount of area needs to be removed from hub to meet requirement of 2d air gap? Thx
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Air gap at drain hub
- Thread starter Milkin
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