BoCo Alert System

Boulder County non-emergency offices will be closed on Monday, May 29 for Memorial Day.

Radon Photo Gallery

Radon Photo Gallery

correct sub-slab depressurization system

Correct Sub-Slab Depressurization System Installation

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.

incorrect installation of fan for radon mitigation

Correct Fan InstallationThe 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.

correct fan wiring for radon mitigation

Correct Fan Wiring

The fan is wired to a switch within sight of the fan, which is wired to a GFI circuit.

incorrect installation of fan for radon mitigation

Incorrect Installation of a FanThe 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.

incorrect radon system venting

Incorrect System Venting

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 installation of vent for radon mitigation

Incorrect Installation of Vent

Incorrect Vent Below Windows – This vent is located beneath windows, which, if opened, will allow radon back into the home.

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Air Quality Program

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