RMS Commercial Building Mitigation 3

Question 1

What is the recommended minimum pipe diameter for a commercial SSD system serving a floor area greater than 10,000 square feet?

Accepted Answer

4 inches

Answer

A 4-inch diameter pipe is the standard minimum for large commercial SSD systems to minimize airflow resistance and maintain system efficiency.

Question 2

In a commercial building, where should the radon fan discharge point be located?

Accepted Answer

At least 10 feet above grade and away from windows and air intakes

Answer

Fan discharge must be directed away from occupied areas, windows, and air intakes—typically at least 10 feet above grade—to prevent re-entry of radon.

Question 3

Which condition would most likely INCREASE radon entry in a commercial building with a sub-slab depressurization system already installed?

Accepted Answer

HVAC system creating negative pressure relative to sub-slab

Answer

If the building HVAC creates interior negative pressure greater than the SSD system's depressurization, radon can be pulled in through slab cracks and openings.

Question 4

What is the purpose of a diagnostic smoke test during commercial building radon mitigation planning?

Accepted Answer

To identify sub-slab communication pathways and air leakage routes

Answer

Smoke tests help identify where sub-slab air communicates with the building interior and locate bypass pathways that can affect mitigation system performance.

Question 5

For a commercial building with a crawl space and conditioned slab areas, what combined mitigation approach is typically used?

Accepted Answer

Crawl space encapsulation with sub-membrane depressurization plus SSD

Answer

Combined buildings require sub-membrane depressurization in the crawl space and sub-slab depressurization under slab areas for complete radon control.

(RMS) Radon Mitigation Specialist Practice Test

(RMS) Radon Mitigation Specialist Practice Test

RMS Commercial Building Mitigation 3