RMS Ventilation & Airflow Management 2

Question 1

What is the primary purpose of a sub-slab depressurization (SSD) system in radon mitigation?

Accepted Answer

Create negative pressure beneath the slab to prevent radon entry

Answer

SSD systems create negative pressure under the foundation slab, preventing radon-laden soil gas from entering the building.

Question 2

When installing a radon mitigation fan in an attic, which factor is most critical for maintaining system effectiveness?

Accepted Answer

Weatherproof housing rated for temperature extremes

Answer

Attic-mounted fans must have weatherproof housings rated for the temperature extremes experienced in unconditioned attic spaces.

Question 3

A building has both a basement and a crawl space. What mitigation approach typically provides the most comprehensive radon reduction?

Accepted Answer

Install separate mitigation systems for each area

Answer

Buildings with multiple sub-structure areas often require separate mitigation systems for each zone to effectively address all radon entry points.

Question 4

Which diagnostic test helps determine if suction points in a sub-slab system are adequately interconnected?

Accepted Answer

Communication test using a vacuum cleaner and smoke pencil

Answer

A communication test using a vacuum and smoke pencil verifies that negative pressure from a suction point extends throughout the sub-slab aggregate.

Question 5

What does a manometer reading of -5 Pa at the diagnostic hole indicate in an active SSD system?

Accepted Answer

The fan is drawing negative pressure successfully under the slab

Answer

A negative Pa reading (below zero) confirms the SSD fan is successfully creating the intended negative pressure field beneath the slab.

(RMS) Radon Mitigation Specialist Practice Test