(1)
The trap arm of a fixture that has a hydraulic load of not more than 1½ fixture units may be connected to the vertical section of a circuit vent, additional circuit vent, offset relief vent or yoke vent, provided
(a)
not more than 2 fixtures are connected to the vent pipe,
(b)
where 2 fixtures are connected to the vent pipe, the connection is made by means of a double sanitary T fitting, and
(c)
the section of the vent pipe that acts as a wet vent is not less than NPS 2. (See Note A-7.5.4.5.(1))