Positive Pressure Fan Radon

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.

Positive pressure fan radon. 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. The fan draws clean air into the property and disperses it around the property to very gently pressurise the building. Positive pressure fans are more effective where radon levels are below 500bq.

This method is called positive pressurisation or positive input ventilation. Radon comes into your home or office because the air pressure is lower than it is outside drawing radon in like a vacuum. The flow of air and radon from the ground may also be reduced. 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 radon gas concentration in any building is determined by the radon concentration in the soil soil permeability and the pressure differential between the soil and the building. A positive pressure system is used to reduce radon levels in buildings. I was wondering if one could create positive air pressure in the crawl with a blower or fan would it make much difference in radon levels. 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.

Macneish september 9 2007 9 58am 2. What s the proper term for the pressure of soil source gas and what. 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. 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.

It involves a special fan being installed either within the loft or on an external wall to disperse air through the building. If you must use an exhaust fan open several windows in the home or office as well. Exhaust fans further decrease the air pressure so using them actually increases the concentration of radon in the air.