Par. 1. - In buildings where a series of bathrooms or kitchens are located directly over each other and have a common soil or waste pipe, the back air pipe required shall be a vent line connecting with each outlet branch close to the water-closet connection or outlet from the sink trap, each branch bent to connect to vent line above the top of the highest fixture on each floor, the vent line to connect to main bent line above the top of the highest fixture in the building.

Batteries of Water-Closets

Par. 2. - In the case of batteries of water-closets or other fixtures the special air pipe from each trap may be omitted, provided that the soil or waste pipe, undiminished in size, is continued to a point above the roof or revented into the main soil pipe system above the top of the uppermost fixture.

Par. 3. - The commissioner shall prepare explanatory sketches showing the method of construction described in this section.

Section 119. Refrigerator Wastes and Drip Pipes

Par. 1. - All drip or overflow pipes shall be extended to some place in open sight, and in no case shall any such pipe be connected directly with the drain pipe. No waste pipe from a refrigerator or other receptacle in which provisions are stored shall be connected directly with a drain or other waste pipe. The waste pipes from all other fixtures shall be connected directly with a drain pipe. Refrigerator wastes connecting with two or more stories shall be supplied with a trap on the branch for each floor and extended through the roof.