IICRC COMMERCIAL DRYING SPECIALIST STUDY GUIDE
2025/2026 QUESTIONS WITH SOLUTION GRADED A+
✔✔What are two examples of a confined space you might find on a commercial job? -
✔✔HVAC duct plenums, elevator pits, mechanical chases, raised floor environments,
crawl spaces
✔✔When fire extinguishers are provided on site, employers shall - ✔✔Provide training
✔✔The primary determinate of the likelihood of success as well as the approach to
drying hardwood sports floors is its construction - ✔✔True
✔✔When a ventilated hardwood sports floor has water that has migrated under it, the
drying method that has the highest probability of success is - ✔✔Bottom drying
✔✔Options for drying a non ventilated hardwood floor (no gap) - ✔✔Top drying,
negative mat system
✔✔When drying concrete with deeply held or bound water, it can be beneficial to
increase_________ and decrease ___________ - ✔✔Vapor pressure differential
Air flow
✔✔The accumulation of dissolved salts that may appear on the surface of a concrete,
tile or grout is called - ✔✔Efflorescence
✔✔Plaster may have originally been applied over wood lathe or metal lathe. Which one
must you dry in a more controlled manner? - ✔✔Wood lathe
✔✔Plaster walls absorb and release water ______ than drywall - ✔✔Slower
✔✔Desiccant based dehumidifiers remove water from the air by - ✔✔Direct absorption
process
✔✔Refrigerant based dehumidifiers remove water from the air by - ✔✔Cooling air below
dew point which causes condensation along the coil that is removed
✔✔There are ___________ BTU/h in one ton of cooling - ✔✔12,000
✔✔The enthalpy of the leaving (outlet) air of s DX air conditioner would typically be
___________ the entering (inlet) air - ✔✔Lower than
✔✔If the air entering your cooling unit is 95 f at 35% RH and the air leaving the unit is
55 f at 65gr/lb, your unit is doing - ✔✔Sensible and latent cooling
, ✔✔During the use of a large DX unit as a dehumidifier, the ambient conditions at night
are dropping to 70 f and 30%RH, based on these nighttime lows and what you know
about the performance of refrigerant units you can determine the unit is - ✔✔Removing
no moisture
✔✔Additional sensible energy (heat) is usually a beneficial by product of - ✔✔A
desiccant dehu
✔✔Monitoring the affected area and materials when using a heat drying system is
important to ensure - ✔✔Temperatures stay within their limits
✔✔Heat drying systems perform best in what conditions? - ✔✔When outdoor air is
cooler and drier than indoors
✔✔A heat drying system includes - ✔✔A heating apparatus
A delivery system
A means of exhausting the moisture laden air from building
✔✔If the HVAC system has been subjected to water damage, the restorer should -
✔✔Recommend be evaluated before use
✔✔Continuously running exhaust systems pulls in very little outside air, therefore they
do not need to be considered during sizing of drying equipment
true or false - ✔✔False
✔✔In commercial building power and equipment: 480/3/60 means - ✔✔480 volts / 3
phase / 60 Hertz
✔✔When requested to connect a 480/3/60 piece of equipment to building power you
should only do so if the available power is the same (480/3/60)
True or false - ✔✔True
✔✔A portable electrical distribution panel is not required to be equipped with ground
fault circuit interrupter protection
True or false - ✔✔False
✔✔Successfully managing a project involves completing the scope of work,
_____________________ and within the. ________________ - ✔✔On time
And within budget
2025/2026 QUESTIONS WITH SOLUTION GRADED A+
✔✔What are two examples of a confined space you might find on a commercial job? -
✔✔HVAC duct plenums, elevator pits, mechanical chases, raised floor environments,
crawl spaces
✔✔When fire extinguishers are provided on site, employers shall - ✔✔Provide training
✔✔The primary determinate of the likelihood of success as well as the approach to
drying hardwood sports floors is its construction - ✔✔True
✔✔When a ventilated hardwood sports floor has water that has migrated under it, the
drying method that has the highest probability of success is - ✔✔Bottom drying
✔✔Options for drying a non ventilated hardwood floor (no gap) - ✔✔Top drying,
negative mat system
✔✔When drying concrete with deeply held or bound water, it can be beneficial to
increase_________ and decrease ___________ - ✔✔Vapor pressure differential
Air flow
✔✔The accumulation of dissolved salts that may appear on the surface of a concrete,
tile or grout is called - ✔✔Efflorescence
✔✔Plaster may have originally been applied over wood lathe or metal lathe. Which one
must you dry in a more controlled manner? - ✔✔Wood lathe
✔✔Plaster walls absorb and release water ______ than drywall - ✔✔Slower
✔✔Desiccant based dehumidifiers remove water from the air by - ✔✔Direct absorption
process
✔✔Refrigerant based dehumidifiers remove water from the air by - ✔✔Cooling air below
dew point which causes condensation along the coil that is removed
✔✔There are ___________ BTU/h in one ton of cooling - ✔✔12,000
✔✔The enthalpy of the leaving (outlet) air of s DX air conditioner would typically be
___________ the entering (inlet) air - ✔✔Lower than
✔✔If the air entering your cooling unit is 95 f at 35% RH and the air leaving the unit is
55 f at 65gr/lb, your unit is doing - ✔✔Sensible and latent cooling
, ✔✔During the use of a large DX unit as a dehumidifier, the ambient conditions at night
are dropping to 70 f and 30%RH, based on these nighttime lows and what you know
about the performance of refrigerant units you can determine the unit is - ✔✔Removing
no moisture
✔✔Additional sensible energy (heat) is usually a beneficial by product of - ✔✔A
desiccant dehu
✔✔Monitoring the affected area and materials when using a heat drying system is
important to ensure - ✔✔Temperatures stay within their limits
✔✔Heat drying systems perform best in what conditions? - ✔✔When outdoor air is
cooler and drier than indoors
✔✔A heat drying system includes - ✔✔A heating apparatus
A delivery system
A means of exhausting the moisture laden air from building
✔✔If the HVAC system has been subjected to water damage, the restorer should -
✔✔Recommend be evaluated before use
✔✔Continuously running exhaust systems pulls in very little outside air, therefore they
do not need to be considered during sizing of drying equipment
true or false - ✔✔False
✔✔In commercial building power and equipment: 480/3/60 means - ✔✔480 volts / 3
phase / 60 Hertz
✔✔When requested to connect a 480/3/60 piece of equipment to building power you
should only do so if the available power is the same (480/3/60)
True or false - ✔✔True
✔✔A portable electrical distribution panel is not required to be equipped with ground
fault circuit interrupter protection
True or false - ✔✔False
✔✔Successfully managing a project involves completing the scope of work,
_____________________ and within the. ________________ - ✔✔On time
And within budget
