hes in diameter.

SEC. 5. MAIN TRAP.--An iron running trap with two clean-outs
must be placed in the house drain near the front wall of the
house, and on the sewer side of all connections. If placed
outside the house or below the cellar floor the clean-outs
must extend to surface with brass screw cap ferrules caulked
in. If outside the house, it must never be placed less than 4
feet below the surface of the ground.

SEC. 6. FRESH-AIR INLET.--A fresh-air inlet pipe must be
connected with the house drain just inside of the house trap
and extended to the outer air, terminating with a return bend,
or a vent cap or a grating with an open end 1 foot above grade
at the most available point to be determined by the building
department.

The fresh-air inlet pipe must be 4 inches in diameter for
house drains of 6 inches or less and as much larger as the
building department may direct for house drains more than 6
inches in diameter.

SEC. 7. LAYING OF HOUSE SEWERS AND DRAINS.--House sewers and
house drains must, where possible, be given an even grade to
the main sewer of not less than 1/4 inch to the foot.
Full-sized "Y"- and "T"-branch fittings for handhole
clean-outs must be provided where required on house drain and
its branches. No clean-out need be larger than 6 inches.

SEC. 8. FLOOR DRAINS.--Floor or other drains will only be
permitted when it can be shown to the satisfaction of the
department of building that their use is absolutely necessary,
and arrangements made to maintain a permanent water seal, and
be provided with check or back-water valves.

SEC. 9. WEIGHT AND THICKNESS OF CAST-IRON PIPE.--All cast-iron
pipes must be uncoated excepting all laid under ground, which
shall be thoroughly tarred, sound, cylindrical and smooth,
free from cracks, sand holes and other defects, and of uniform
thickness and of grade known to commerce as extra heavy.
Cast-iron pipe including the hub shall weigh not less than the
following weights per linear foot:

2-inch pipe 5-1/2 pounds per foot.
3-inch pipe 9-1/2 pounds per foot.
4-inch pipe 13 pounds per foot.
5-inch pipe 17 pounds per foot.
6-inch pipe 20 pounds per foot.
7-inch pipe 27 pounds per foot.
8-inch pipe 33-1/2 pounds per foot.