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

Desiccant dehumidifier

Answer

Enthalpy dehumidifier

Answer

Evaporative cooler

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

Above 80°F and high humidity

Answer

At exactly 70°F with 50% RH

Answer

Only in outdoor environments above freezing

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

Filter airborne mold spores

Answer

Measure airflow in CFM across drying zones

Answer

Compress air into wall cavities for rapid drying

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

1 air mover per 1 dehumidifier

Answer

10 air movers per dehumidifier

Answer

Dehumidifiers are used without air movers in residential settings

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

2

Answer

6

Answer

8

Question 6

Which type of air mover is preferred for drying wall cavities using the injection-drying technique?

Accepted Answer

Centrifugal (snail-shell) air mover with hose attachment port

Answer

Large industrial axial fan

Answer

Box fan on a stand

Answer

Whole-house HVAC fan set to 'on'