Radon Fan Sizing

Radon Systems and Fan Information

Like many things, Radon mitigation fans are not one size fits all. Fans can be customized to a specific house. The homeowner also has some say in what it looks like, with many features that can be unique to their house and color. The Radon fan that is chosen to mitigate the gas is carefully determined based off many factors.

The fan is what essentially does the Radon mitigating. The fans create a suction in the pipe, pulling the air out of the ground and soil beneath the house’s foundation. The fan then pushes this air out of the pipes above the house, allowing the air to disperse. Above the house the air is safe? because right as it leaves the pipe, the air above the house dilutes the toxins which makes it okay to breathe.

Installing the fan is different than installing the pipes. Usually the pipes are on the side of the house, connecting the ground soil to the fan. The fan is generally situated at the top of the house or system to help push the air out of the pipe into the outside air on top of the house. If the house’s pipe runs through the attic, homeowners need to be aware of its’ insulation. The technician that installs your fan will know what to look for. There needs to be insulation in the attic to make sure the warm air from the bottom of the house does not hit the cold air at the top. This could cause moisture to condense, which will lead to moisture and mold in your attic. A correctly installed pipe will help the fan mitigate the Radon gas in the house better.

Low-Power Fans would be beneficial in Sub-Slab Depressurization systems. The houses that install this type of fan have a porous Sub-Slab gravel layer and a well-sealed slab. The low-power fans last longer and work more quietly, which is why these fans are generally recommended in residential cases.

Medium-Power Fans work similarly to the Low-Power Fans, however, they are more common in houses with larger slabs and porous Sub-Slab gravel layers. They also work well for ones with smaller slabs with less porous Sub-Slab material. The pipes that are used with this fan are also used with the Low-Power Fans, which are 3” to 4” pipes and a single slab penetration.

High-Flow Fans are more common for retrofit installations. They are able to affect both air leakage and feeble Sub-Slab porosity. This is caused by the lack of the Sub-Slab gravel. Because of the high power, 4” pipes are usually used for these fans with one or more slab penetrations.

High-Suction Fans are used in houses with weak porosity material under the slab, which can be such as sand or clay. This is also paired with low air flow, which makes the High-Suction Fans so valuable. Fans are the key to a Radon mitigation system. Based off the style or the Radon gas in the house, a mitigation system will be specific to those demographics. Radon professionals and technicians will know what fan to use based off your specific house and its level. Talk to them if you have any questions or concerns about the type of fan or the size of fan the house needs.

Radon Test Results