This picture shows the correct installation of piping from beneath the floor to the fan, which is outside the home. There is a label listing the contractor’s information and a U-tube monometer to indicate that a vacuum is being pulled on the system.
The fan is mounted outside of the living space and is vertical. It is connected to the piping by rubber reducers, which helps control noise. The exhaust from the fan runs beyond the eave of the roof and exits vertically with no cap on the vent pipe.
The fan is wired to a switch within sight of the fan, which is wired to a GFI circuit.
The fan should always be outside of the living space of the home, outside the building, in the attic, or in the garage; not in the basement, as in this photograph.
This vent has two problems. First, it is below the eave of the roof. Second, it is not vertical and open. There is the possibility of this vent freezing over with ice in the winter and causing the system to be ineffective
Incorrect Vent Below Windows – This vent is located beneath windows, which, if opened, will allow radon back into the home.