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sub-slab depressurization 6

https://alpha-wiki.win/index.php/Understanding_Radon_Edwardsville_IL:_What_Homeowners_Should_Know

Sub-slab depressurization is a technique where a fan creates suction beneath a concrete floor to draw out soil gases like radon before they can enter a building. It's commonly installed during new construction or retrofitted in crawl spaces, using a network of pipes in the gravel layer to pull vapors from below the slab and vent them safely outside. The system works continuously, often with a manometer to show it's running properly.

sub-slab depressurization 2

https://radonsysteminstallationguide.hexaforgey.com/posts/understanding-radon-system-installation-cost-in-st.-louis

Sub-slab depressurization is a common method used to keep harmful soil gases like radon from entering homes by creating a vacuum beneath the concrete floor. A pipe is inserted through the slab, and a fan gently pulls air from the soil, which then vents safely outside. It's a quiet, low-maintenance system that protects indoor air quality without interfering with daily life.