If your home has a passive radon pipe running up through the attic, an inline fan can turn it into an active system with very little change to the outside of the house. We connect York homeowners with a local contractor who checks the pipe, mounts the fan in the attic, and confirms the conversion is working.
When an Attic Fan Is a Good Fit
An attic fan works well when the passive pipe already runs from the slab, up through the house, and out through the roof. The attic gives the contractor a place to mount the fan outside the living space, and the existing roof penetration stays as it is.
It is a good fit when the attic is reachable, there is room to work around the pipe, and power can be brought to the fan location. It also suits homeowners who do not want a pipe and fan on the outside wall.
An exterior mount may be better if the attic is very tight, if the passive pipe does not run through an accessible attic, or if the fan location would sit directly over a bedroom where sound could be a concern. The contractor will look at both options during the estimate.
What the Conversion Involves
The contractor first confirms that the passive pipe connects to the gravel under the slab and that the pipe joints are sound. Then a section of pipe in the attic is cut out and the fan is installed with rubber couplings, mounted so it is supported and does not vibrate against framing.
Power is the other piece. The fan needs a dedicated connection near its location, and the contractor will explain how that will be handled and whether an electrician is involved.
A manometer is installed low on the pipe, usually in the basement or utility area, so you can check suction without going into the attic. Key slab openings such as a sump or large gaps are sealed so the fan can build suction efficiently.
Retesting After Conversion
Once the fan is running, the contractor reads the gauge to confirm suction and marks the starting level. Then the next step is yours: a short-term retest after the fan has been running at least a full day.
Place the kit in the lowest lived in level with windows and doors closed, follow the directions, and send it in promptly. The result should be clearly lower than your test before the conversion.
If it is not, the contractor can check for leaks, look at the slab connection, or consider a stronger fan. Keep the test results and the conversion paperwork together. If the attic is ever reinsulated or remodeled, make sure the fan and pipe are left accessible and undisturbed.
Activate the Pipe You Already Have
An attic fan conversion makes use of the pipe your builder already installed. With the right information, the next step is usually simpler than it first seems. Knowing the steps ahead of time takes much of the stress out of the process. Every home is a little different, and a short visit is the fastest way to learn what yours needs. Call us and we will connect you with a local contractor who can confirm your York home is a good fit, install and wire the fan, and help you plan the retest.
Frequently Asked Questions
Can a passive radon system be converted to active with an attic fan in York?
Yes, in most homes where the passive pipe runs through an accessible attic. The contractor confirms the pipe reaches the gravel under the slab, installs an inline fan on the pipe in the attic, arranges power, adds a gauge, and seals key slab openings.
When is an attic fan a good fit versus an exterior mount?
An attic fan is a good fit when the pipe already runs through a reachable attic with room to work and power nearby. An exterior mount may be better if the attic is tight, the pipe is not accessible, or the fan would sit above a bedroom where sound matters.
Is a retest needed after a passive to active conversion?
Yes. After the fan has run for at least a full day, place a short-term test kit in the lowest lived in level with windows and doors closed. The result should be clearly lower than before. If not, the contractor can look for leaks or other adjustments.