How the system works
- Suction point. A hole about 4 to 6 inches across is cored through the basement slab, usually near the centre of the house or near the sump. A small pit is dug out under the slab so air moves freely.
- Pipe. PVC pipe runs from the suction point up and out. It can go through the rim joist and up the outside wall, or up through the garage and out the roof.
- Fan. An inline radon fan is mounted outside the living space, in the garage, attic or on the exterior wall. It runs all the time and pulls soil gas from under the slab before it gets into the house.
- Sealing. Open sumps get a sealed lid, and major cracks and gaps at the slab edge are sealed so the fan isn't just pulling basement air.
- Gauge. A manometer on the pipe shows the system is pulling. If the liquid levels in it are uneven, the fan is working.
What install day looks like
Most homes are done in one day. Expect some coring noise and dust in the basement, a few hours of pipe work, and the fan wired in. Finished basements take more planning to route the pipe neatly, usually through a closet or utility room.
Results
A properly installed system can cut radon by up to 90%. You should re-test with a long-term test after install to confirm the level is under 200 Bq/m³.
Why hire a certified installer
Health Canada recommends a mitigation professional certified under the C-NRPP program. Certified installers follow the Canadian standard for system design, labelling and testing.
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