CPR CPR Equipment Selection & Deployment

Question 1

Which class of dehumidifier is most commonly deployed for structural drying in residential water damage jobs?

Accepted Answer

Refrigerant (mechanical) dehumidifier

Answer

Refrigerant dehumidifiers are the industry standard for residential drying due to their high efficiency at typical indoor temperatures and lower operating cost.

Question 2

Under what ambient temperature condition does a desiccant dehumidifier outperform a refrigerant unit?

Accepted Answer

Below 45°F where refrigerant coils lose efficiency

Answer

Refrigerant dehumidifiers lose significant capacity below ~45°F because the evaporator coils frost; desiccant units use chemical adsorption and operate efficiently in cold conditions.

Question 3

The primary purpose of axial air movers in structural drying is to:

Accepted Answer

Create high-velocity airflow across wet surfaces to accelerate evaporation

Answer

Axial air movers direct high-velocity air across wet floors and walls, thinning the boundary layer of humid air at the surface and accelerating moisture evaporation.

Question 4

According to IICRC S500 guidelines, what is the standard placement ratio of air movers to dehumidifiers for a typical residential water loss?

Accepted Answer

Approximately 4–6 air movers per dehumidifier

Answer

IICRC S500 drying science calls for roughly 4–6 air movers per dehumidifier so that evaporative capacity is matched by sufficient moisture removal capacity.

Question 5

A restorer is drying a Category 2 loss in a room with 200 sq ft of affected flooring. Using the 1 air mover per 50 sq ft rule of thumb, how many air movers should be deployed?

Accepted Answer

4

Answer

200 sq ft ÷ 50 sq ft per air mover = 4 air movers as the initial equipment placement estimate per IICRC S500 guidance.

(CPR) Certified Professional Restorer Practice Test

(CPR) Certified Professional Restorer Practice Test

CPR CPR Equipment Selection & Deployment