No more then 904 1/8th bends and on the VT usually one return bend 180 degree fitting to prevent vandalism BUT local codes should be checked
No. You vent air from a sewer line.
An air admittance vent is a mechanical sewer vent which allows air to enter into the sewage system but does not allow exhaust of sewer gases.
Water Jetting
Yes it can be shortened, making sure that the top of the vent is at least one meter above the highest point of the roof.
By removing foul sewer fumes and venting them to the outside air nomally through the vent terminal knowing warm air rises
It must be plugged up. try to snake it out.
Yes i drain line has got to be vented. A sewer line creates gases which has to be vented otherwise two things happen. Either, you get terrible smells around your property or your sewer lines can explode due to trapped sewer gases, this is costly and can be a painful smelly experience.
It allows sewer gases to safely escape.
Vent piping is a pipe that runs outside and is connected to the drain line of your home. this helps the water in the drain to move to your septic/sewer.
To vent off odors emanating from the septic/sewer system and to allow the toilet to flush correctly and the other drains to empty correctly.
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.
Warmer moisturized sewer fumes hitting the colder ambient temperature on a vent terminal