780 CMR, app AF § AF103.6.1
Add a new section AF103.6.1 "T" Fitting and Vent Pipe as follows:
A "T" fitting shall be inserted beneath the soil-gas-retarder and be connected to a three-inch minimum vertical vent pipe. The vent pipe shall extend through the conditioned space of the dwelling and terminate not less than 12 inches (305 mm) above the roof in a location not less than ten feet (3,048 mm) away from any window or other opening into the conditioned spaces of the building that is less than two feet (610 mm) below the exhaustpoint. The horizontal legs of the "T" fitting shall connect to two five-foot long pieces of four-inch diameter perforated pipe laid horizontally in a 50 in 2 bed of gravel, filled with the same gravel as used in the gas-permeable layer.
780 CMR, app AF § AF103.6.1