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  • Sub-slab Depressurization (SSD) Tech Sheet – vim
    SSD is the most common engineering control installed in buildings at or near vapor intrusion sites The operational objective for SSD systems is to create a negative pressure below the building slab Depressurization occurs when the pressure below the slab is less than that of indoor air
  • GUIDELINES FOR THE DESIGN, INSTALLATION, AND OPERATION OF SUB-SLAB . . .
    A sub-slab depressurization system basically consists of a fan or blower which draws air from the soil beneath a building and discharges it to the atmosphere through a series of collection and discharge pipes
  • TRC - WORK PLAN FOR SSDS AT BUILDING S - US EPA
    SSDV systems use a fan-powered vent to remove soil gas from beneath the building slab By removing soil gas from beneath the slab, the sub-slab pressures are reduced relative to indoor air pressures
  • Understanding Radon Mitigation: Sub-Slab Depressurization
    What is a Sub-Slab Depressurization System? Like other radon mitigation systems, the objective of a sub-slab depressurization system is to prevent radon from infiltrating a building from beneath the soil or foundation
  • Sub Slab Depressurization System Explained: Radon Mitigation
    A sub slab depressurization system addresses the core issue of radon intrusion by creating a negative pressure environment beneath the building’s foundation In simple terms, this system actively draws radon-laden air from below the building and safely vents it outside
  • Sub Slab Radon Mitigation: How It Works Why It Matters
    Sub slab depressurization (also called active soil depressurization) works by creating a negative pressure beneath your concrete slab It pulls radon-laden soil gases from below the foundation and vents them safely above the roofline
  • Sub-Slab System 5
    subsurface depressurization system prevents vapor intrusion by directing hazardous vapors in the soil to the exterior of the building Sub-slab depressurization systems are installed in buildings with slab (concrete) floors
  • Sub Slab Depressurization: How It Works for Radon Removal
    What is a Sub Slab Depressurization System? A sub slab depressurization system is a radon mitigation method designed to prevent radon gas from entering your home
  • Operation and Maintenance Manuals for Sub-Slab Depressurization Systems
    Vapor mitigation systems including passive or active sub-slab depressurization systems (SSDSs) to mitigate the intrusion of contaminated vapors into on-site buildings are a common requirement for the issuance of No Further Action letters and Certificates of Completion under DOEE programs
  • Sub-Slab Depressurization System (SSDS) Design Plan
    Install a sub-slab depressurization system (SSDS) to allow the lateral movement, collection and venting of gas vapor from below the subject building System components include an existing network of 2-inch schedule 40 PVC vent points installed at select locations throughout the building floor slab





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