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Mechanical Vent and/or Proper Venting?
In 2013, one 'mechanical vent' was installed (actually replaced) under a kitchen sink that is attached to another kitchen sink (through the wall) because these 2 housing units on the 1st floor share the same piping as their units are adjacent to each other. The plumber installed it because one of these sinks was backing up into the basement's sink directly below. Their units are on the 1st floor of a 3 floor level old 1860 historic house. The basement unit's kitchen sink is directly below and 3 years ago (2016) when a bucket of sudsy water was dumped into the 1st floor sink above the basement's sink, it overflowed again into the basement's sink. The drain people snaked the units involved and the main drain, checked that the mechanical vent was ok and now 3 years later the problem has reoccurred. 3 years ago the drain company rep told us that the 'mechanical vent' , while still in tact, was not legal any longer and the sinks needed 'proper venting' from the roof. This was reported but management didn't do anything. Now 3 years later, management just wants to snake the main drain (not the 3 units affected) and are not addressing the 'mechanical vent' issue. I am not a plumber but I am seeking to understand how it works as we are in the unit most affected by the recurring deluge into our sink. If someone can help with some thoughts on the following questions, I would really appreciate it, so we can prevent this from reoccurring.
1) Are mechanical vents the same as AAV vents? Are AAV vents a possible solution to this? or are they illegal, too?
2) What does 'venting through the roof' actually mean? The two units which share the wall and the mechanical vent have 2 other units directly above them. The roof is on the 3rd floor.
3) What would you recommend that I tell management?
4) Should I call inspectional services? The stuff that overflows into the sink might be a health code violation.