7.5.6.2.Vent Pipe Connections (See Note A-7.5.6.2.)

(1) Vent pipes in a plumbing system shall be installed so as to be direct as possible to a vent stack or open air, as the case may be, and so that any horizontal run below the flood level of the fixture to which the vent pipe is installed is eliminated where structurally possible. (2) Except for wet vents, where a vent pipe is connected to a nominally horizontal sanitary drainage pipe, the connection shall be above the horizontal centre line of the sanitary drainage pipe. (3) Unused vent pipes installed for future connections shall be permanently capped with an end cleanout or an adapter and plug.