The term flat vent has been used for some time to describe a horizontal vent connection to a horizon soil or waste pipe. All vent connections are supposed to be run vertically if possible but there are instances where you may not have any choice but to run a vent horizontally until a wall can be used.

What does flat vent mean?

A flat vent pipe is used for HVAC that has to flow inside a 2×4 stud wall. They are used to vent driers, stove hood vents, and regular HVAC.

Do I need a vent for every drain?

Whether you’re putting in a tub, toilet, sink, or floor drain, they all need a plumbing vent on the drain to make it work properly. If there is no vent, a number of problems may occur: The fixture without a vent may drain slowly. The drain will likely make gurgling noises.