Radon originates in the ground. So it is quite common for a sump pump system to double as a radon collecting system.
The pit is covered so the radon exhaust pump will draw more radon laden air from the perimeter drain pipes as opposed to exhaust large quantities of furnace heated air or air conditioner cooled air from the basement at large. Also to reduce the evaporation of water from the pit so as to increase the load on the basement dehumidifier.
The radon exhaust pump may be located at the upper end of the vent pipe rather than down at the pit.
Ground water going to the sump pump pit, where the quantity of such water will be increased when it rains, must not be pumped into a septic tank. So it is rare to have the basement perimeter drain pipes emptying into the same pit that receives sewage or gray water.
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Last edited by AllanJ; 11-01-2016 at 06:54 PM.
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