The branch vent shall not be less than the following sizes:
1-1/4 inches in diameter for 1-1/4 inch trap.
1-1/2 inches in diameter for 1-1/2 inch to 2-1/2 inch trap.
2 inches in diameter for 3 inch to 4 inch trap.
One-half their diameter, for traps 3 inches and over.
Where two or more closets are placed side by side, on a horizontal branch, the branch line shall have a relief extended as a loop. A pipe 2 inches in diameter shall be sufficient as a loop vent for two closets. A pipe 3 inches in diameter shall be sufficient as a relief for three or four closets; and where more than four closets are located on the same branch the relief shall not be less than 4 inches in diameter. All house drains and soil lines on which a water closet is located must have a 4-inch main vent line. Where an additional closet is located in the cellar or basement, and within 10 feet of main soil or vent line, no relief vent will be required for said closet; but where it is more than 10 feet, a 2-inch vent line will be required. Relief vent pipes for water closets must not be less than 2 inches in diameter, for a length of 40 feet, and not less than 3 inches in diameter, for more than 40 feet.
No re-vent from traps under bell traps will be required.
In any building having a sewer connection with a private or public sewer used for bell-trap connections or floor drainage only, a 2-inch relief line must be extended to the roof of the building from rear end of main. House drains, constructed for roof drainage only, will not require a relief vent.
A floor trap for a shower shall be vented, unless located in the cellar or ground floor the paving of which renders the trap inaccessible.
SEC. 30. HORIZONTAL VENT PIPES.--Where rows of fixtures are placed in a line, fitting of not less than 45 to the horizontal must be used on vent lines to prevent filling with rust or condensation; except on brick or tile walls, where it is necessary to channel same for pipes, 90 fittings will be allowed. Trapped vent pipes are strictly prohibited. No vent pipe from the house side of any trap shall connect with the ventilation pipe or with sewer, soil or waste pipe.
SEC. 31. OFFSET ON VENT LINES.--All offsets on vent lines must be made at an angle of not less than 45 to the horizontal, and all lines must be connected at the bottom with a soil or waste pipe, or the drain, in such manner as to prevent the accumulation of rust, scale or condensation.
No sheet metal, brick, or other flue shall be used as a vent pipe.
SEC. 32. SETTING OF FIXTURES.--All fixtures must be set open and free from all enclosing woodwork. Water closets and urinals must not be connected directly or flushed from the water-supply pipes except when flushometer valves are used.
Each water closet must be flushed from a separate cistern, the water from which is used for no other purpose, or may be flushed through flushometer valves.
Rubber connection and elbows are not permitted.
Pan, plunger, or hopper closets will not be permitted in any building. No range closet either wet or dry, nor any evaporating system of closets shall be constructed or allowed inside of any building.
A separate building constructed especially for the purpose, must be provided in which such range closets shall be set.
All earthenware traps must have heavy brass floor flange plates, soldered to the lead bends and bolted to the trap flange, and the joint made permanently secure and gas-tight.
In all buildings sewer-connected there must be at least one water closet in each building. There must be a sufficient number of water closets so that there will never be more than 15 people to each water closet.
Separate water closets and toilet rooms must be provided for each sex in buildings used as workshops, office buildings, factories, hotels and all places of public assembly.
In all buildings the water closet and urinal apartments must be ventilated into the outer air by windows opening on the same lot as the building is situated on or by a ventilating skylight placed over each room or apartment where such fixtures are located.
In all buildings the outside partition of any water closet or urinal apartment must be air-tight and extend to the ceiling or be independently ceiled over. When necessary to light such apartments properly the upper part of the partition must be provided with translucent glass. The interior partitions of such apartments must be dwarfed partitions.
In alteration work where it is not practicable to ventilate a closet or urinal apartment by windows or skylight to the outer air, there must be provided a sheet-iron duct extending to the outer air, the area of the duct must be at least 144 square inches for one water closet or urinal, and an additional 72 square inches for each addition closet or urinal added therein.
SEC. 33. URINALS.--All urinals must be constructed of materials impervious to moisture and that will not corrode under the action of urine. The floors and walls of urinal apartments must be lined with similar non-absorbent and non-corrosive material.
The platforms and treads of urinal stalls must be connected independently of the plumbing system, nor can they be connected with any safe-waste pipe.
The copper lining of water closet and urinal cisterns must not be lighter than 12 ounces copper, and must be stamped on lining with maker's name. Where lead is used it must not weigh less than 4 pounds to the square foot. All other materials are prohibited.
SEC. 34. FIXTURES PROHIBITED.--Wooden wash trays, sinks, or bath tubs are prohibited inside buildings. Such fixtures must be constructed of non-absorbent materials. Cement or artificial stone tubs will not be permitted, unless approved by the plumbing inspector and building department.
Yard water closets will not be permitted except as approved by the plumbing inspector and then passed by the building department.
SEC. 35. PRIVY VAULTS AND CESSPOOLS.--No privy vault or cesspool for sewage, shall be constructed in any part of the city where a sewer is at all accessible. In parts of the city where no sewer exists privy vaults and cesspools shall not be located within 2 feet of party or street line nor within 20 feet of any building. Before these are constructed application for permission therefore shall be made to the building department.
SEC. 36. MATERIAL AND WORKMANSHIP.--All material used in the work of plumbing and drainage must be of good quality and free from defects. The work must be executed in a thorough and workmanlike manner.