Vent hole or holes are located under rim of toilet.Best way to see it is with small mirror.Take clothes hanger and make sure all holes especially the large ones are not clogged .They will become clogged from time to time.
Yes if the vent pipe is 4" and vertical by code and there is nothing connected between your toilet tee and where you would connect your new toilet tee. If not worried about codes then yes you can connect to a 3" vent line if no other vent lines are connected down stream. If you have a vent pipe that is less then 3" and or you have other vents connected between your old toilet tee and your new toilet tee then NO you can not connect a new tee for your toilet.
Yes as ALL fixtures need to have the vent placed above the FLOOD LEVEL RIM
The vent is the "hole" where they defecate out of.
No
Who needs a toilet
is a cat and hole..., ehehehhe
vent hole ,ventiduct
Within 24 "
Yes.
partially clogged drain or vent, improperly installed vent or drain
Within 24 "
Any vent is usually the size of the drain or waste pipe it is connected to. 3 or 4 inch on a toilet.