(1)
Except as provided in Article 7.5.7.1. and Sentence 7.5.3.1.(7), the minimum nominal pipe size of an additional circuit vent or relief vent installed in conjunction with a circuit vent is permitted to be one NPS smaller than the required nominal pipe size of the circuit vent, but need not be larger than NPS 2.
(2)
The nominal pipe size of the sanitary drainage pipe acting as a relief vent in accordance with Sentence 7.5.3.1.(4) shall be in conformance with Table 7.4.10.6.-A, 7.4.10.6.-B or 7.5.8.1., and Article 7.5.7.1., whichever nominal pipe size is the largest considering the hydraulic load drained into the sanitary drainage pipe.