I have 2 bathrooms right on top of each other. I just noticed as I installed 2 new toilets that there wasn't a vent. I placed an aav about 5 ft from the 2nd toilet. I am still getting negative pressure in my toilets and am needing advice on vent placement. My washing machine goes to a separate septic system in a 1.5. I planned on changing that to a 2 inch and tying it in with my toilet stacks which is now a 3 inch. Also the aav is a 2 inch stubbed up about 6 inches from the line. Any advice would be appreciated
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