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What is minimum size vent for toilets?

Upstairs and downstairs toilets shar the same stack which is 3". the upstairs toilet works fine (brand new). the downstairs toilet is getting suction. i snaked the vent from the roof all the way...

I switched my old 3.5 gpf toilet with a new style 1.6 gpf. Now the water level in the bowl is lower than the internal trap. I tried 3 other new toilets. Still same thing. The water in the bowl is...