What is Radon?
Radon is a colorless, odorless and tasteless gas produced by the decay of uranium & radium. Unlike some other indoor pollutants, it can not be detected by our senses. A naturally occurring radioactive gas, Radon is produced in most soil and rocks. As a result, all houses have some Radon gas, as does the outdoor air. consumer guide to radon mitigation
How to remove it from your home
Sub-Slab Depressurization There are several strategies for removing radon in air depending on the particular structure. The most common is called a “sub-slab depressurization” system where a hole is drilled into the concrete slab and a “suction pit” is created beneath the slab. A PVC pipe is fitted and sealed into the suction pit and the pipe is then run to a point where an in-line exhaust fan will be mounted. The RMS (Radon Mitigation Standards) require that the radon exhaust fan be mounted either in a ventilated attic space and vented through the roof or mounted outside and vented above the roof line
The PVC pipe is run either outside of the home or retro fitted inside of the home so the fan can be installed into the ventilated attic space or garage attic.
The PVC pipe must terminate a minimum of 12 inches above the eves and a minimum of 10 feet away or 2 feet above from any windows or openings. An inline fan is installed and creates the vacuum under the slab. The fan draws radon soil gas out from under the slab before it can enter into the home.
HRV (Heat Recovery Ventilation) An example where a HRV would be a good option is a home where the foundation is built with stone or granite permitting lateral intrusion of radon soil gas. HRV is a stand alone unit with integral blowers which provide a more frequent air change within the basement than would occur naturally. Manufacturers claim that the HRV can also help reduce moisture levels as well. For radon reduction purposes the HRV is intended to run continuously and draws about the same power as a typical radon fan. Maintenance is a simple matter of cleaning the core and filters on occasion, the frequency would depend on the environment.
The HRV takes air from the outside and brings it into the basement. Before it is released into the basement, the core of the unit takes inside air and reconditions the air.
This means during the summer months, the warm air taken from outside is cooled off with the air leaving the basement. During winter months, the basement air is warming the air taken from outside. It is very important to make sure the amount of air coming in the basement space versus the amount of air going out of the basement space are equal. Usually HRV’s have a reduction rate of 50% to 75% of radon soil gas.
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