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i am a mechanical contractor that recently bought a house that has a fan for radon.the fan is mounted on the outside of the house and runs 24/7.it has a u tube manometer mounted on the pipe that measures the pressure.my question is does anyone know of a control that could measure the radon level and turn this fan on and off as needed, rather then having it run all the time?i thought about putting a time clock on it and having it on for 12 hours and then off for 12 hours,but do not know if this is the best way to go.also how is the level of radon measured? i know it is not ppm,i keep seeing bq/m3, but have yet to find what this measurement is short for. thanks.