XIV. All waste or soil pipes must be continued, full bore, above the roof, without return bend, and provided with a wire screen at top. Lead pipe may be used for horizontal lines two inches or less in diameter. All other waste-pipes, two or more inches in diameter, must be of iron. The term waste-pipe or soil-pipe includes all branches taken off the main lines and continued, vertically or horizontally, seven or more feet. The size of waste-pipes shall be as follows: Those that receive the discharge from eight sinks or basins shall be 3 inches in diameter at least; those that receive the discharge from three to seven sinks or basins shall be 2 inches in diameter at least, and those that receive the discharge from one or two sinks shall be not less than 1 1/2 inch. Waste-pipes from safes under wash-basins or other fixtures must not connect directly with any sewer, soil-pipe, or other waste-pipe. Waste-pipes from refrigerators, if carried to the sewer, must first discharge into a drip-pan, and be provided with a trap and stop-cock between said drip-pan and sewer.

♦ XV. All main pipes receiving the discharge from water-closets and other fixtures must be of cast-iron; must be sound, free from holes, and of a uniform thickness, and what is known as extra heavy pipe, weighing as follows:

Corresponding fittings will be required. All branches or deviations from straight lines must be made with proper fittings. Soil and waste pipes must in all cases be continued, of undiminished size, at least two feet above the roof, without return bend, and provided with a cap, grating, or screen at the top.

XVI. Air-pipes must be of iron or lead (sheet metal will not be permitted), and must not terminate in chimney-flues. They must be carried up inside of the house. When more than one water-closet discharges in the same vertical line of soil-pipe, a separate air-pipe connection, not less than two inches in diameter, must be provided for the trap of each, which pipe may connect with the soil-pipe above the upper water-closet. When the trap of the water-closet is set two or more feet from the vertical line of the soil-pipe, a return connection must in all cases be provided, even where there is but one water-closet on the line. Air-pipes from several traps may be combined by branching together and then carried into a soil-pipe above the inlet from the highest fixture, or continued above the roof. The weight of material for air-pipes shall be the same as that specified in the case of soil and waste pipes.

XVII. All rain-water conductors which are carried up within the walls of a building must be of iron, as required for soil-pipe. Connections with such rain-water conductors along their vertical course for the discharge of sewage or waste-water therein will not be permitted.