MRS Containment & Isolation Procedures 2

Question 1

What is the minimum number of polyethylene sheeting layers required for a critical barrier in a full containment setup?

Accepted Answer

Two layers of 6-mil sheeting

Answer

Full containment critical barriers require two layers of 6-mil polyethylene sheeting to provide sufficient durability and vapor resistance.

Question 2

When constructing an airlock for a containment zone, what is the purpose of the inner flap overlap?

Accepted Answer

To create a pressure differential that prevents spore escape

Answer

Overlapping inner flaps maintain the pressure differential by preventing a direct open path between the contaminated zone and the clean area.

Question 3

A technician discovers that the HVAC system services both the containment area and adjacent clean rooms. What is the correct action?

Accepted Answer

Seal all HVAC registers inside and near the containment zone

Answer

All HVAC registers within and adjacent to the containment must be sealed to prevent cross-contamination through the duct system.

Question 4

Which factor most directly determines whether a project requires mini containment versus full containment?

Accepted Answer

The total square footage of affected material

Answer

IICRC S520 and EPA guidelines use the size of the affected area (typically 10 sq ft cutoffs) to determine the required containment level.

Question 5

During active mold remediation, what is the recommended air pressure differential inside a full containment relative to the surrounding area?

Accepted Answer

-0.05 to -0.10 inches of water column

Answer

A negative pressure of -0.02 to -0.05 inches of water column (some references cite up to -0.1 in.wc) ensures air flows inward, preventing spore migration outward.

(MRS) Mold Remediation Specialist Practice Test

(MRS) Mold Remediation Specialist Practice Test

MRS Containment & Isolation Procedures 2