Flood Restoration Water Extraction and Drying Equipment 2 — Questions and Answers
Question 1: How often should desiccant dehumidifiers be preferred over refrigerant dehumidifiers in flood restoration?
- In low-temperature environments below 45°F (Correct answer)
- In high-temperature environments above 80°F
- When drying synthetic materials only
- When power availability is limited
Correct answer: In low-temperature environments below 45°F
Desiccant dehumidifiers remain effective at low temperatures where refrigerant models lose efficiency, making them ideal for cold conditions.
Question 2: What is the function of a negative air machine in flood restoration?
- Create negative pressure to contain contaminants (Correct answer)
- Increase airflow for faster drying
- Measure negative pressure in walls
- Remove standing water via suction
Correct answer: Create negative pressure to contain contaminants
A negative air machine creates negative pressure within a work area to prevent cross-contamination by filtering and exhausting air to the outside.
Question 3: Which filter type must a negative air machine use when Category 3 contaminated water is involved?
- HEPA filter (Correct answer)
- Activated carbon filter
- Fiberglass filter
- UV filter
Correct answer: HEPA filter
HEPA filters capture 99.97% of particles 0.3 microns or larger, making them mandatory for highly contaminated Category 3 water situations.
Question 4: What is the typical airflow rating used to size air movers for a drying job, expressed per square foot?
- 1 CFM per square foot (Correct answer)
- 10 CFM per square foot
- 50 CFM per square foot
- 100 CFM per square foot
Correct answer: 1 CFM per square foot
Industry guidelines recommend approximately 1 CFM (cubic foot per minute) of airflow per square foot of affected area when placing air movers.
Question 5: What is 'stacking' in the context of dehumidifier placement for flood drying?
- Placing dehumidifiers in series to maximize moisture removal (Correct answer)
- Stacking equipment for storage
- Layering wet materials before drying
- Running two dehumidifiers simultaneously in one room
Correct answer: Placing dehumidifiers in series to maximize moisture removal
Stacking involves positioning multiple dehumidifiers in a series arrangement so that drier air from one unit feeds into the next for maximum efficiency.
Question 6: Which industry standard governs the proper use of drying equipment in flood restoration in the US?
- IICRC S500 (Correct answer)
- OSHA 1910
- EPA 402-K-01-001
- NFPA 921
Correct answer: IICRC S500
The IICRC S500 Standard for Professional Water Damage Restoration sets the guidelines for equipment use, drying goals, and documentation.
Flood Restoration Water Extraction and Drying Equipment 2
How often should desiccant dehumidifiers be preferred over refrigerant dehumidifiers in flood restoration?