choche

An Studer vent is an AAV it's just calling it by the brand name.You need at least one fresh air vent that terminates through roof to outside air and at least one half the diameter of the underground. The baffle opens due to any pressure change in the sytem, and they have been known cause fixtures to gurgle if theirs other vent problems in sytem. I would never put one on a laundry even though it's legall because of suds back-up, and vent problems down the line especilly on the newer high efficency ones. They work great under kitchen sink at least 4 inches above the drain line,and I'm pretty sure they can go vertical and on a 45. Hope this helps???