Commercial Drying Specialist (IICRC) 2025 Exam
Questions With Verified Correct Answers
If the restorer has been informed by the customer that water did not affect adjacent areas or floors,
the restorer is safe-to assume that. True or False - ✔✔✔ - False, check all adjacent areas
Satisfactory completion of a job or phase of a job should be obtained when________ - ✔✔✔ -
Returning the building or a portion of it to the client
According to the current IICRC S500 Standard, a restorer should establish an initial
dehumidification capacity needed on a project, but should be modified after that based
on___________________________________ - ✔✔✔ - Subsequent or following days psychrometric readings
Some of the other project factors that may need to be considered in adjusting the dehumidification
requirement can be (describe at least three) - ✔✔✔ - An agreed upon deadline to complete the job
Power is known to be less than adequate to serve the indicated inventory of equipment
The building will be occupied during the drying process, potentially causing equipment cut off,
frequent opening of doors, higher moisture load
A schedule imposed by client
Required pressure differential to achieve contaminant control
Sizing desiccant dehumidification in larger commercial drying applications typically begins with
determining a targeted________________________ - ✔✔✔ - Air change per hour
The build-out density is a factor which considers the ability to __________________________to all areas of
a building as well as the amount of _____________________________________that needs to be addressed. -
✔✔✔ - Circulate air
Air changes per hour
The weather impact factor considers the ______________________________________ as well as the ability of
the building envelope to_____________________________________ - ✔✔✔ - Impact the weather could likely
, have on your drying environment as well as the ability of the building envelope to keep the outside
air from influencing your environment
Using the "Quick Guidelines for Cooling", how many tons of air conditioning would you use
tocondition75,000 square feet of a grocery store? - ✔✔✔ - 75000sf/ 350 = 215 tons
Direct expansion systems circulate refrigerant through a cold evaporator coil that cools the
airstream that is then ______________ - ✔✔✔ - Ducted into and distributed throughout the building fan
coil units located within the building
Chiller-water systems circulate conditioned water (chilled or heated) through the system that is
distributed to ________________ - ✔✔✔ -
The temperature at which humidity in air reaches saturation (100% RH), below which water vapor
will condense from that air to form condensation on surfaces is called the ____ - ✔✔✔ - Dew point
Convection, conduction and radiation are the three mechanisms of _ - ✔✔✔ - Vapor diffusion
Enthalpy is a measure of the total energy in the air and is the total of the ____________energy and the
______________ energy - ✔✔✔ - Sensible
Latent
Humidity ratio, dew point and vapor pressure are all absolute ways of expressing the moisture
content of the air. True or False - ✔✔✔ - True
As the temperature of a material is increased, it's internal vapor pressure ________ - ✔✔✔ - Increases
The2nd law of thermodynamics states that energy flows only from being concentrated in one place
to becoming diffused or dispersed. True or False - ✔✔✔ - True
The two primary mechanisms by which moisture moves through materials are_________________ and
____________________ - ✔✔✔ - Capillary action
Questions With Verified Correct Answers
If the restorer has been informed by the customer that water did not affect adjacent areas or floors,
the restorer is safe-to assume that. True or False - ✔✔✔ - False, check all adjacent areas
Satisfactory completion of a job or phase of a job should be obtained when________ - ✔✔✔ -
Returning the building or a portion of it to the client
According to the current IICRC S500 Standard, a restorer should establish an initial
dehumidification capacity needed on a project, but should be modified after that based
on___________________________________ - ✔✔✔ - Subsequent or following days psychrometric readings
Some of the other project factors that may need to be considered in adjusting the dehumidification
requirement can be (describe at least three) - ✔✔✔ - An agreed upon deadline to complete the job
Power is known to be less than adequate to serve the indicated inventory of equipment
The building will be occupied during the drying process, potentially causing equipment cut off,
frequent opening of doors, higher moisture load
A schedule imposed by client
Required pressure differential to achieve contaminant control
Sizing desiccant dehumidification in larger commercial drying applications typically begins with
determining a targeted________________________ - ✔✔✔ - Air change per hour
The build-out density is a factor which considers the ability to __________________________to all areas of
a building as well as the amount of _____________________________________that needs to be addressed. -
✔✔✔ - Circulate air
Air changes per hour
The weather impact factor considers the ______________________________________ as well as the ability of
the building envelope to_____________________________________ - ✔✔✔ - Impact the weather could likely
, have on your drying environment as well as the ability of the building envelope to keep the outside
air from influencing your environment
Using the "Quick Guidelines for Cooling", how many tons of air conditioning would you use
tocondition75,000 square feet of a grocery store? - ✔✔✔ - 75000sf/ 350 = 215 tons
Direct expansion systems circulate refrigerant through a cold evaporator coil that cools the
airstream that is then ______________ - ✔✔✔ - Ducted into and distributed throughout the building fan
coil units located within the building
Chiller-water systems circulate conditioned water (chilled or heated) through the system that is
distributed to ________________ - ✔✔✔ -
The temperature at which humidity in air reaches saturation (100% RH), below which water vapor
will condense from that air to form condensation on surfaces is called the ____ - ✔✔✔ - Dew point
Convection, conduction and radiation are the three mechanisms of _ - ✔✔✔ - Vapor diffusion
Enthalpy is a measure of the total energy in the air and is the total of the ____________energy and the
______________ energy - ✔✔✔ - Sensible
Latent
Humidity ratio, dew point and vapor pressure are all absolute ways of expressing the moisture
content of the air. True or False - ✔✔✔ - True
As the temperature of a material is increased, it's internal vapor pressure ________ - ✔✔✔ - Increases
The2nd law of thermodynamics states that energy flows only from being concentrated in one place
to becoming diffused or dispersed. True or False - ✔✔✔ - True
The two primary mechanisms by which moisture moves through materials are_________________ and
____________________ - ✔✔✔ - Capillary action
