The house sewer shall be at least four inches in diameter for all types permitted in §
248-72.
Every house drain or private sewer which passes
under a house or building or within three feet of the cellar wall
of any house or building shall be cast-iron pipe.
A cast-iron running trap, in no case less than
four inches with two cleanout hubs, shall be placed in the house drain
either inside or outside the foundation on the sewer side of all connections,
except a Y-fitting, to receive the discharge of an automatic sewage
ejector, oil separator or boiler blowoff where they are used. If placed
below the cellar floor or in a driveway, the trap shall be made accessible,
in a suitable masonry manhole with iron cover.
A fresh-air inlet pipe shall be connected with
the house drain just inside the house trap, with a separate fitting
in the drain, and extended to the outer air, terminating with a return
bend with open end one foot above the surface of the ground, or through
foundation wall with quarter bend looking down in a location approved
by the Building Inspector and shown on plans.
A. For a four-inch house drain, the fresh-air inlet shall
be four inches.
B. For five-inch and six-inch house drains, the fresh-air
inlet shall be not less than four inches.
C. For seven-inch and eight-inch house drains, the fresh-air
inlet shall be not less than six inches.
D. For ten-inch and twelve-inch house drains, the fresh-air
inlet shall be not less than eight inches.