Positive Pressure Fan Radon

If you must use an exhaust fan open several windows in the home or office as well.

Positive pressure fan radon.

Almost all buildings exert a negative pressure suction on the soil because of the natural stack effect and exhaust devices that exist in all buildings. The introduction of this extra air raises the internal air pressure slightly thus inhibiting the draw of gas from the soil which normally occurs. The second method of radon reduction positive pressure involves the installation of a special fan in an attic or loft or on the internal side of an external wall if a roof void is not present. What s the proper term for the pressure of soil source gas and what.

Radon gas can damage cells in your lungs which can lead to cancer radon is responsible for about 21 000 lung cancer deaths each year in the united states though it usually takes 5 to 25 years to. The fan draws clean air into the property and disperses it around the property to very gently pressurise the building. A positive pressure system is used to reduce radon levels in buildings. That is to say the exhaust is under positive pressure with regard to the ambient pressure of the structure if the pipe has a leak the radon will enter the building.

Radon comes into your home or office because the air pressure is lower than it is outside drawing radon in like a vacuum. 2 placing the fan in such a position that the radon is pushed along the exhaust pipe rather than pulled through the exhaust pipe. This method is called positive pressurisation or positive input ventilation. The flow of air and radon from the ground may also be reduced.

Positive pressure fans are more effective where radon levels are below 500bq. Exhaust fans further decrease the air pressure so using them actually increases the concentration of radon in the air. Has positive air pressure been used for radon mitigation. A positive ventilation system can be effective in homes with radon levels up to and around 500 bq m 3.

Positive ventilation brings fresh air into a home and dilutes the radon. Macneish september 9 2007 9 58am 2. Over 500bq a sump system or under floor ventilation system should also be considered as these are likely to be more effective at higher radon levels.