Drainage, Waste & VentQuestion 164 of 360
Where a building (house) trap is installed on the building drain, it is commonly accompanied by…
a.a grease interceptor
b.a backwater valve on the vent
c.a sump pump
d.a fresh-air inlet on the upstream (building) side to ventilate the drainage system
Explanation
A building (house) trap isolates the building drainage from the public sewer, and when used it is paired with a fresh-air inlet on the building side so the drainage system stays ventilated. Because a house trap can collect debris and block flow, many modern codes discourage or prohibit it. The fresh-air inlet terminates in open air, screened against pests.
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