IICRC Applied Structural Drying
Verified Questions And Answers
2025 Latest Solutions
1.Air Filtration Device (ADF):ANSWER Commonly called an air scrubber
or negative air machine if airborne particles need to be reduced, you
could use an appropriately installed
2.Air Filtration Device: ANSWER AFD
3.Assembly Construction: ANSWER Prior to determining the best drying
system for affected materials, restorers should identify and understand
the assembly construction (ie wall assembly, floor assembly)
4.Category 1: ANSWER water originates from a sanitary source and does
not pose substan- tial risk for dermal, ingestion, inhalation, or exposure.
Uncontaminated and routinely cleaned
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, 5.Category 2: ANSWER water contains significant contamination and
has the potential to cause discomfort or sickness if contacted or
consumed by humans
6.Category 3: ANSWER water is grossly contaminated and can contain
pathogenic, toxigenic, or other harmful agents
7.Sewage Back Up: ANSWER Category 3
8.Clean water supply line: ANSWER Category 1
9.Class 1: ANSWER Least amount of water absorption and evaporation
load - Wet porous materials - water loss is less then 5% of the area
10.Class 2: ANSWER Significant amount of water absorption and
evaporation load - water intrusion where wet represents 5% - 40% of
the area.
11.Class 3: ANSWER greatest amount of water absorption and
evaporation load. Water intrusion where wet represents over 40%
of the area
12.Class 4: 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.
13.Closed drying system 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.
14.Conventual refrigerant dehumidifier: ANSWER Removes water vapor
from the air by lowering the temperature of the incoming air to below
dew point and causing the water to condense on the coils. Cold and hot
surfaces created with gases inside a closed coil system.
15.Combination Drying System 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
16.Desiccant dehumidifier ANSWER: Removes water vapor from the air
https://www.stuvia.com/user/HIGRADES
, through absorption. Usually requires more amperage as compared to
refrigerant dehumidifier. Desic- cants 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
https://www.stuvia.com/user/HIGRADES
Verified Questions And Answers
2025 Latest Solutions
1.Air Filtration Device (ADF):ANSWER Commonly called an air scrubber
or negative air machine if airborne particles need to be reduced, you
could use an appropriately installed
2.Air Filtration Device: ANSWER AFD
3.Assembly Construction: ANSWER Prior to determining the best drying
system for affected materials, restorers should identify and understand
the assembly construction (ie wall assembly, floor assembly)
4.Category 1: ANSWER water originates from a sanitary source and does
not pose substan- tial risk for dermal, ingestion, inhalation, or exposure.
Uncontaminated and routinely cleaned
https://www.stuvia.com/user/HIGRADES
, 5.Category 2: ANSWER water contains significant contamination and
has the potential to cause discomfort or sickness if contacted or
consumed by humans
6.Category 3: ANSWER water is grossly contaminated and can contain
pathogenic, toxigenic, or other harmful agents
7.Sewage Back Up: ANSWER Category 3
8.Clean water supply line: ANSWER Category 1
9.Class 1: ANSWER Least amount of water absorption and evaporation
load - Wet porous materials - water loss is less then 5% of the area
10.Class 2: ANSWER Significant amount of water absorption and
evaporation load - water intrusion where wet represents 5% - 40% of
the area.
11.Class 3: ANSWER greatest amount of water absorption and
evaporation load. Water intrusion where wet represents over 40%
of the area
12.Class 4: 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.
13.Closed drying system 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.
14.Conventual refrigerant dehumidifier: ANSWER Removes water vapor
from the air by lowering the temperature of the incoming air to below
dew point and causing the water to condense on the coils. Cold and hot
surfaces created with gases inside a closed coil system.
15.Combination Drying System 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
16.Desiccant dehumidifier ANSWER: Removes water vapor from the air
https://www.stuvia.com/user/HIGRADES
, through absorption. Usually requires more amperage as compared to
refrigerant dehumidifier. Desic- cants 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
https://www.stuvia.com/user/HIGRADES
