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The gaseous products can be sewer gases or other unpleasant fumes that may be noxious or hazardous if allowed to back up within the building.It is well known to incorporate a vent pipe into a building by extending a pipe, made of a material such as acrylonitrile butadiene styrene (ABS) or polyvinyl chloride (PVC), from the waste water system to the exterior of the building.
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