| |
j. RADON SYSTEM fan out vent location slab seal
A sub-slab radon mitigation system requires a fan to create a pressure difference between the area above the slab (living area) and the area below the slab and within the mitigation pipe. The basement slab should be sealed to protect against the whole basement becoming negatively pressurized. The idea is to have the radon gas move to the lower pressure area, through the pipe and to the outside air where it can be safely diluted. Originally, radon fans were installed in the basement. Subsequently, it was found to be a better practice to install the fan outside of the living space to ensure that all radon piping run through the house is under negative pressure. In the event that the pipe is broken or cracked, radon gas will not be released into the living area. The radon piping should be terminated above the roof line to protect against the radon laden air from re-entering the house through an open window or being breathed by someone working or playing outside near the vent pipe. Radon is a odor-less and color-less gas which cannot be detected during a home inspection. Testing the home by a radon measurement specialist is recommended for areas which have an incidence of radon.
|
