IICRC - APPLIED STRUCTURAL
DRYING EXAM QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100%
CORRECT ANSWERS /ALREADY
GRADED A+
Air Filtration Device (ADF) - CORRECT ANSWER ✔✔- Commonly called an air
scrubber or negative air machine if airborne particles need to be reduced, you
could use an appropriately installed _______ ________ ________
Air Filtration Device - CORRECT ANSWER ✔✔- AFD
Assembly Construction - CORRECT ANSWER ✔✔- Prior to determining the best
drying system for affected materials, restorers should identify and understand the
assembly construction (ie wall assembly, floor assembly)
Category 1 - CORRECT ANSWER ✔✔- water originates from a sanitary source
and does not pose substantial risk for dermal, ingestion, inhalation, or exposure.
Uncontaminated and routinely cleaned
Category 2 - CORRECT ANSWER ✔✔- water contains significant contamination
and has the potential to cause discomfort or sickness if contacted or consumed by
humans
1
,Category 3 - CORRECT ANSWER ✔✔- water is grossly contaminated and can
contain pathogenic, toxigenic, or other harmful agents
Sewage Back Up - CORRECT ANSWER ✔✔- Category 3
Clean water supply line - CORRECT ANSWER ✔✔- Category 1
Class 1 - CORRECT ANSWER ✔✔- Least amount of water absorption and
evaporation load - Wet porous materials - water loss is less then 5% of the area
Class 2 - CORRECT ANSWER ✔✔- Significant amount of water absorption and
evaporation load - water intrusion where wet represents 5% - 40% of the area.
Class 3 - CORRECT ANSWER ✔✔- greatest amount of water absorption and
evaporation load. Water intrusion where wet represents over 40% of the area
Class 4 - CORRECT ANSWER ✔✔- deeply held or bound water. Significant
amount of water absorption into low evaporation materials. Drying may require
special drying methods, longer drying time, or substantial water vapor pressure
differentials.
Closed drying system - CORRECT ANSWER ✔✔- Uses mechanical
dehumidification and is not open to outside air. Used if there are security issues,
the outside air is not conductive to drying or when access to outside air is not
possible.
Conventual refrigerant dehumidifier - CORRECT ANSWER ✔✔- Removes water
vapor from the air by lowering the temperature of the incoming air to below dew
2
, point and causing the water to condense on the coils. Cold and hot surfaces created
with gases inside a closed coil system.
Combination Drying System - CORRECT ANSWER ✔✔- uses some outdoor air
with dehumidifiers to accelerate the drying process. This can include periodically
venting (flushing) the structure, using negative pressure or using small openings to
the outside
Desiccant dehumidifier - CORRECT ANSWER ✔✔- Removes water vapor from
the air through absorption. Usually requires more amperage as compared to
refrigerant dehumidifier. Desiccants create the lowest vapor pressure which work
best on low porosity materials. When a desiccant dehu is drawing outside air and
ducting processed air inside a building it can create positive pressure in the
building. To improve desiccant dehu performance, it may be beneficial to pre-cool
the desiccants air intake
Infiltration - CORRECT ANSWER ✔✔- High humidity outside air could affect
the drying climate adversely due to ______________
1. Tightness of the building envelope
2. Prevailing weather
3. HVAC
4. Class of Water
5. Building Construction
5. Build out density - CORRECT ANSWER ✔✔- Favors that affect the detailed
dehumidifier calculation is:
Detailed Dehumidification Calculation - CORRECT ANSWER ✔✔- See Chart:
Cubic Feet : Divided by 70 = Base Pints per day
3
DRYING EXAM QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100%
CORRECT ANSWERS /ALREADY
GRADED A+
Air Filtration Device (ADF) - CORRECT ANSWER ✔✔- Commonly called an air
scrubber or negative air machine if airborne particles need to be reduced, you
could use an appropriately installed _______ ________ ________
Air Filtration Device - CORRECT ANSWER ✔✔- AFD
Assembly Construction - CORRECT ANSWER ✔✔- Prior to determining the best
drying system for affected materials, restorers should identify and understand the
assembly construction (ie wall assembly, floor assembly)
Category 1 - CORRECT ANSWER ✔✔- water originates from a sanitary source
and does not pose substantial risk for dermal, ingestion, inhalation, or exposure.
Uncontaminated and routinely cleaned
Category 2 - CORRECT ANSWER ✔✔- water contains significant contamination
and has the potential to cause discomfort or sickness if contacted or consumed by
humans
1
,Category 3 - CORRECT ANSWER ✔✔- water is grossly contaminated and can
contain pathogenic, toxigenic, or other harmful agents
Sewage Back Up - CORRECT ANSWER ✔✔- Category 3
Clean water supply line - CORRECT ANSWER ✔✔- Category 1
Class 1 - CORRECT ANSWER ✔✔- Least amount of water absorption and
evaporation load - Wet porous materials - water loss is less then 5% of the area
Class 2 - CORRECT ANSWER ✔✔- Significant amount of water absorption and
evaporation load - water intrusion where wet represents 5% - 40% of the area.
Class 3 - CORRECT ANSWER ✔✔- greatest amount of water absorption and
evaporation load. Water intrusion where wet represents over 40% of the area
Class 4 - CORRECT ANSWER ✔✔- deeply held or bound water. Significant
amount of water absorption into low evaporation materials. Drying may require
special drying methods, longer drying time, or substantial water vapor pressure
differentials.
Closed drying system - CORRECT ANSWER ✔✔- Uses mechanical
dehumidification and is not open to outside air. Used if there are security issues,
the outside air is not conductive to drying or when access to outside air is not
possible.
Conventual refrigerant dehumidifier - CORRECT ANSWER ✔✔- Removes water
vapor from the air by lowering the temperature of the incoming air to below dew
2
, point and causing the water to condense on the coils. Cold and hot surfaces created
with gases inside a closed coil system.
Combination Drying System - CORRECT ANSWER ✔✔- uses some outdoor air
with dehumidifiers to accelerate the drying process. This can include periodically
venting (flushing) the structure, using negative pressure or using small openings to
the outside
Desiccant dehumidifier - CORRECT ANSWER ✔✔- Removes water vapor from
the air through absorption. Usually requires more amperage as compared to
refrigerant dehumidifier. Desiccants create the lowest vapor pressure which work
best on low porosity materials. When a desiccant dehu is drawing outside air and
ducting processed air inside a building it can create positive pressure in the
building. To improve desiccant dehu performance, it may be beneficial to pre-cool
the desiccants air intake
Infiltration - CORRECT ANSWER ✔✔- High humidity outside air could affect
the drying climate adversely due to ______________
1. Tightness of the building envelope
2. Prevailing weather
3. HVAC
4. Class of Water
5. Building Construction
5. Build out density - CORRECT ANSWER ✔✔- Favors that affect the detailed
dehumidifier calculation is:
Detailed Dehumidification Calculation - CORRECT ANSWER ✔✔- See Chart:
Cubic Feet : Divided by 70 = Base Pints per day
3
