IICRC ASD ACTUAL EXAM QUESTIONS WITH ANSWERS 2025/2026
GRADED A+
AFD - negative air machines-NAM; air scrubbers; HEPA filters
Conventional Dehumidifier - RH 40% 55 GPP
LGR - 30% RH 34 GPP
Desiccant - 10% RH 10-15 GPP
AHAM Rating - Pints removed at 80º F / 60% RH in 24 hours
Refrigerants - Most efficient operating conditions 70º -90º F.
Desiccants - Most efficient with incoming air from coolest/driest air possible; capable of
creating greatest pressure differentials (air and vapor pressures); produces low humidity
ratio (gpp) important to dry Class 4 materials, dense materials, and complex systems.
Dehumidifier uses - closed-drying environments; multiple layers of materials; security
limitations; high outside (and inside) humidity conditions; no ventilation ports; basement
areas
Conventional Class 1 - 100
Conventional Class 2 - 40
Conventional Class 3 - 30
Conventional Class 4 - N/A
LGR Class 1 - 100
LGR Class 2 - 50
LGR Class 3 - 40
LGR Class 4 - 40
Desiccant Class 1 - 1 ACH
Desiccant Class 2 - 2 ACH
Desiccant Class 3 - 3 ACH
Desiccant Class 4 - 3 ACH
,Amperes - the amount of electricity (current) flowing in a circuit
Voltage - The force of electricity flow in a circuit
Watts - the amount of electricity an electrical device uses when operating
British Thermal Units - heat generated by electrical device
BTU Formula - amps x volts x 3.4 = BTU per hour
HVAC - cooling ability to remove 12,000 Btu per ton per hour
Residential Electric - 15 amp
Commercial Electric - 20 amp
Power Splitters - when there is limited amperage or fuses(typically, 30 amp-dryer/50
amp-range
Light weight extension cords - shock/fire hazards
Power Consumption Formula $ - volts x amps x 24 hours = watts ÷ 1000 = kW x cost
per kW@day
Moisture Sensor - senses moisture in materials over 17% MC; helps determine
perimeter of water damage; unable to determine which layer is wet or when dry
Thermo-hygrometer - determines temperature / RH in all required atmospheric areas of
inspection; helps determine open or closed drying system; further determines
dehumidifier recommendations after initial placement
Moisture Meters - invasive and non-invasive; determines moisture content; establish,
monitor and determine when dry standards are met
Miscellaneous Meters - infrared camera and thermometer; manometer; borescope; data
logger
HEPA - High Efficiency Particulate Air (99.97% capture rate of particulates at .3 micron
size)
EPA - Environmental Protection Agency (U.S. federal agency with regulatory control
over biocides)
FIFRA - Federal Insecticide, Fungicide and Rodenticide Act -U.S. federal regulations
administered by EPA
, Disinfectants -
Sanitizers -
Sterilizers -
Carpet installation methods - stretch-in, direct glue-down, double glue-down
Carpet drying methods - in-place, full float, partial float
Carpet construction - woven-Axminster, Wilton; usually natural fibers; tufted-primarily
synthetic
Carpet delamination - separation of primary from secondary backing; laminate strength
loss up to 85% when wet (causes -over-aggressive extraction; "flapping" vs. floating;
improper cushion; urine; folding; improper carpet stretch)
Carpet and Category 3 Water - Must remove and dispose; IEP possibly required for
testing; if Category 2 -hot water extraction of carpet required if saved; ground surface
water intrusion also known as Category 3
Carpet Cushion - padding, underlay
Carpet Cushion Types - foam (prime, bonded urethane); rubber; felt (hair/jute,
synthetic); porous and non-porous
Carpet Cushion and Category 2 and 3 water - remove and properly dispose
Wood Flooring Types - strip wood, plank wood, engineered -laminated wood, parquet
Wood Non-Destructive and Non Rotting MC Supporting Fungal Growth - 16%
Wood Destructive and Wood-Rooting Supporting Fungal Growth - 20%
Wood damages from moisutre - cupping -from wood edges and bottom; crowning;
buckling; heaving
Wood drying standard - DS + 10%
Microbiology - fungus; bacteria; virus
Conditions for Microbial Growth - organic food source (cellulose)
moisture (or high humidity)
temperature (most prolific 68-86º F. / 20-30º C.)
stagnant air
time (some 1-2 days; others up to 10-12 days in chronic conditions)
GRADED A+
AFD - negative air machines-NAM; air scrubbers; HEPA filters
Conventional Dehumidifier - RH 40% 55 GPP
LGR - 30% RH 34 GPP
Desiccant - 10% RH 10-15 GPP
AHAM Rating - Pints removed at 80º F / 60% RH in 24 hours
Refrigerants - Most efficient operating conditions 70º -90º F.
Desiccants - Most efficient with incoming air from coolest/driest air possible; capable of
creating greatest pressure differentials (air and vapor pressures); produces low humidity
ratio (gpp) important to dry Class 4 materials, dense materials, and complex systems.
Dehumidifier uses - closed-drying environments; multiple layers of materials; security
limitations; high outside (and inside) humidity conditions; no ventilation ports; basement
areas
Conventional Class 1 - 100
Conventional Class 2 - 40
Conventional Class 3 - 30
Conventional Class 4 - N/A
LGR Class 1 - 100
LGR Class 2 - 50
LGR Class 3 - 40
LGR Class 4 - 40
Desiccant Class 1 - 1 ACH
Desiccant Class 2 - 2 ACH
Desiccant Class 3 - 3 ACH
Desiccant Class 4 - 3 ACH
,Amperes - the amount of electricity (current) flowing in a circuit
Voltage - The force of electricity flow in a circuit
Watts - the amount of electricity an electrical device uses when operating
British Thermal Units - heat generated by electrical device
BTU Formula - amps x volts x 3.4 = BTU per hour
HVAC - cooling ability to remove 12,000 Btu per ton per hour
Residential Electric - 15 amp
Commercial Electric - 20 amp
Power Splitters - when there is limited amperage or fuses(typically, 30 amp-dryer/50
amp-range
Light weight extension cords - shock/fire hazards
Power Consumption Formula $ - volts x amps x 24 hours = watts ÷ 1000 = kW x cost
per kW@day
Moisture Sensor - senses moisture in materials over 17% MC; helps determine
perimeter of water damage; unable to determine which layer is wet or when dry
Thermo-hygrometer - determines temperature / RH in all required atmospheric areas of
inspection; helps determine open or closed drying system; further determines
dehumidifier recommendations after initial placement
Moisture Meters - invasive and non-invasive; determines moisture content; establish,
monitor and determine when dry standards are met
Miscellaneous Meters - infrared camera and thermometer; manometer; borescope; data
logger
HEPA - High Efficiency Particulate Air (99.97% capture rate of particulates at .3 micron
size)
EPA - Environmental Protection Agency (U.S. federal agency with regulatory control
over biocides)
FIFRA - Federal Insecticide, Fungicide and Rodenticide Act -U.S. federal regulations
administered by EPA
, Disinfectants -
Sanitizers -
Sterilizers -
Carpet installation methods - stretch-in, direct glue-down, double glue-down
Carpet drying methods - in-place, full float, partial float
Carpet construction - woven-Axminster, Wilton; usually natural fibers; tufted-primarily
synthetic
Carpet delamination - separation of primary from secondary backing; laminate strength
loss up to 85% when wet (causes -over-aggressive extraction; "flapping" vs. floating;
improper cushion; urine; folding; improper carpet stretch)
Carpet and Category 3 Water - Must remove and dispose; IEP possibly required for
testing; if Category 2 -hot water extraction of carpet required if saved; ground surface
water intrusion also known as Category 3
Carpet Cushion - padding, underlay
Carpet Cushion Types - foam (prime, bonded urethane); rubber; felt (hair/jute,
synthetic); porous and non-porous
Carpet Cushion and Category 2 and 3 water - remove and properly dispose
Wood Flooring Types - strip wood, plank wood, engineered -laminated wood, parquet
Wood Non-Destructive and Non Rotting MC Supporting Fungal Growth - 16%
Wood Destructive and Wood-Rooting Supporting Fungal Growth - 20%
Wood damages from moisutre - cupping -from wood edges and bottom; crowning;
buckling; heaving
Wood drying standard - DS + 10%
Microbiology - fungus; bacteria; virus
Conditions for Microbial Growth - organic food source (cellulose)
moisture (or high humidity)
temperature (most prolific 68-86º F. / 20-30º C.)
stagnant air
time (some 1-2 days; others up to 10-12 days in chronic conditions)
