Private: Radon 202: Inspecting Mitigation Systems
I. General Overview
5 Topics
Definition of Mitigation System
Goals of Radon Mitigation Systems
Additional Benefits of Mitigation Systems
Mitigation System Compliance
Post Mitigation Testing Requirements
II. Active Mitigation Systems
10 Topics
Types of Active Mitigation Systems
Sub-Membrane Depressurization (SMD)
Understanding Systems With Multiple Suction Points
Vent Pipe Requirements
Variances
Entry Routes and Sealing Requirement for Active Systems
Fan Location Criteria
Exterior Fan Installation
Electrical Requirements
Required Labeling of Active System Pipes
III. Passive System Installation
9 Topics
The Radon Resistant Construction Act
Passive Pipe Installation
Vents In Crawlspaces
Soil Gas Retarders
Proactive New Construction Design Requirements
Required Labeling of Passive Pipes
Combination Foundations
Joints in Air Ducts and Plenums
Activation of Passive Systems
Radon 202: Inspecting Mitigation Systems Final Exam
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Required Labeling of Active System Pipes
Private: Radon 202: Inspecting Mitigation Systems
II. Active Mitigation Systems
Required Labeling of Active System Pipes
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Pipe labeled on each floor “Radon Reduction System”.
Circuit breakers for system fan and warning devices labeled “Radon Reduction System” (if necessary).
Mark pressure range on manometers.
Exterior fans and pipe labeled using weatherproof labels.
Mitigation Tag legible from 3′ away.
Manometer
Typically, active systems will have a manometer similar to the one illustrated here. A simple U-tube manometer is mounted to the system vent pipe.
The manometer monitors the operation of the SMD or SSD
depressurization
system fan.
When the liquid levels in the legs of the manometer are uneven, a pressure differential exists, indicating correct operation of the fan and system.
If the manometer liquid levels are even, the fan or system is not operating properly and needs repair.
Mitigation Tag
Installer’s Name
Installer’s Phone Number
Installer’s License Number
Date of Installation
IEMA Tag number
This tag # is to be documented by measurement and mitigation licensees for all systems installed after 11-1-09.
Recommendation to test every 2 years.
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