Radon from Ground and/or Building Materials
MECHANICAL SUPPLY AND EXHAUST VENTILATION, FT/FTX
In these buildings, the first step must be to install a proper ventilation system.
If ground radon is present, an FT system should be used to minimize negative pressure.
To reduce heating costs, the system can be complemented with a heat exchanger, forming an FTX system.
If properly balanced, a certain negative pressure will still remain at the slab level.
If radon levels from the ground remain too high, the air pressure in the ground must be lowered using a radon well or radon suction.
MECHANICAL EXHAUST VENTILATION, F‑VENTILATION
If it is certain that no ground radon is present, mechanical exhaust ventilation (F‑system) may be sufficient.
The advantage of F‑ventilation is its low installation cost.
Note: Installing F‑ventilation may cause ground radon to be drawn into the building even if it was not previously present.
To ensure that ground radon is not drawn in, an FT or FTX system should be chosen.
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