Automatic air vents in attic to replace plumbing roof vent

SYV
SYV Registered Users Posts: 4 ✭
in General Solar Power Topics #1
I am wondering if anyone has tried this. Looks very feasible to do rather than reventing.
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,657 admin
    #2
    I put one on a garage sink sewer line (probably a bit too far from the sink)... It works.

    However, like everything these days there is a law (code) about this stuff:

    https://www.carsondunlop.com/training/resources/waste-plumbing-air-admittance-valves-and-automatic-air-vents-part-one/
    https://www.carsondunlop.com/training/resources/waste-plumbing-air-admittance-valves-and-automatic-air-vents-part-two/

    One typical issue with venting are kitchen islands with sinks. Obviously you don't want a vent stack going up from your island to the ceiling.

    https://www.familyhandyman.com/kitchen/how-to-plumb-an-island-sink/
    https://www.finehomebuilding.com/2019/09/10/a-new-old-way-to-vent-a-kitchen-island

    My in-laws have a "island" like sink and no direct vent stack (inverted U system). It works OK, but after decades (sink with garbage disposal/etc.), sludge and slime did build up in the piping (brother-in-law had to replace the piping when leaks started--just followed the existing design--and I had to snake out the system at times (sewer continues to a wet bar sink 20 feet away).

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • wellbuilt
    wellbuilt Solar Expert Posts: 763 ✭✭✭✭
    #3
    I would just pop the vent out the roof and be done with it.
    I would only use a auto vent if there was no other option.
    Out back  flex power one  with out back 3648 inverter fm80 charge controler  flex net  mate 16 gc215 battery’s 4425 Watts solar .
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  • SYV
    SYV Registered Users Posts: 4 ✭
    #4
    Thanks
    My AHJ is a stickler so maybe no AAV. How about cutting the vent pipe down to about 3" above roof and a few inches below the array. I really don't want to checkerboard the array or add the expense to the customer to move the vent.
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  • wellbuilt
    wellbuilt Solar Expert Posts: 763 ✭✭✭✭
    #5
    In my area the vent pipes need to exit the roof with 3” pipe minimum and 18” off the roof . It’s no big thing to move the vent up to the ridge on the inside and pop out above the array . 
     40 bucks and a hour of time it seams like a no brainer 
    Out back  flex power one  with out back 3648 inverter fm80 charge controler  flex net  mate 16 gc215 battery’s 4425 Watts solar .
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  • wellbuilt
    wellbuilt Solar Expert Posts: 763 ✭✭✭✭
    #6
    My pipe was moved over 6’ so it did not cast a shadow on the panels  this pick was on the shorts day of the year. 
     I could of just ran to the top all so easy  Peezy . 
    Out back  flex power one  with out back 3648 inverter fm80 charge controler  flex net  mate 16 gc215 battery’s 4425 Watts solar .
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