A vacuum will work if you have a hose long enough.
You should not have to clean a vent on the roof. unless you are trying to clean the waste line to the fixture below. Then you would send plumbing rods through the vent on the roof.
yes
No, it has to be vented
Hydrostatic testing of vent, soil and waste piping
In plumbing the roof vent should be a min of 4" to prevent hoarfrost
Yes. The roof vent is usally located on the roof. If the vent is clogged, it can create numerous issues and prevent your plumbing system from working properly.
Your drain waste vent is plugged or leaking somewhere. The drain waste vent is a pipe that carries sewage gas out of your home, exiting usually the roof but sometimes the side of the house. Get it fixed asap, this is not good for you.
YES
A vent Terminal and depending if the roof is strictly for weather protection it terminates about 24" above the roof. If the roof area is for people then it is 7 ft above the roofing surface.
Yes you can get a high wind cap for the vent.
Drain, Waste and Vent System. It is all of the Drain and Waste piping and their associated vent piping
Vent through roof