IICRC - Applied Structural Drying Verified
Questions And Answers
1 AFD - ANSWER-Structure dimensions are 30' x40' x8'
According to the IICRC the desired air change rate per hour (ACR) is 4. The AFDs
you have are rated at 700 CFM.
How many AFDs will you need.
Calculation: Cubic Feet (CF) x ACH / 60 = CFM
CFM/Rated CFM= # of AFD
.1. Tightness of the building envelope
2. Prevailing weather
3. HVAC
4. Class of Water
5. Building Construction
5. Build out density - ANSWER-Favors that affect the detailed dehumidifier
calculation is:
.15
20 - ANSWER-Residential v. commercial - generally, residential ______amp /
commercial ______ amp
(consider never using over 80% of available amperage)
.2 desiccants - ANSWER-You are working on a class 3 water loss that has an
affected area of 15120 CF. You plan to dry the area with a desiccant dehu AHAM
,rated at 385 CFM. How many of these dehumidifiers do you need to install on
this project
.2 LGR dehumidifiers - ANSWER-A water supply line broke in a home affecting
the kitchen, dining room and family room. This is a class 3 Loss
Total sq ft is 1170 with 8' ceilings.
Using the information above and the simplified calculation (per IICRC), how
many 125 ppd LGR dehumidifiers would recommended as an initial deployment
to start drying the affected structure.
.2 LGR dehumidifiers - ANSWER-You are working on a class 2 water loss that has
two affected areas. Area 1 is 3750CF and Area 2 is 2700CF
You plan to dry both areas together using an LGR Dehu rated at 80 ppd at
AHAM. How many of these dehus do you need to install on this project.
.20%
16% - ANSWER-_____% rotting fungi growth IN wood
_____% - non-rotting fungi growth ON wood
.3 AFDs - ANSWER-Structure dimensions are 45' x 50' x 10'. Calculate using
4ACH. The AFDs you have are rated at 500 CFM.
How many AFDs would you need for this project?
Calculation: Cubic Feet (CF) x ACH / 60 = CFM
CFM/Rated CFM= # of AFD
, .3-4 air movers - ANSWER-The dining room is 115sq ft. 8' high ceilings with little
to no wicking. Floor is the only area wet. What is the range of air movers you
would place?
.3. Hallway : 70oz nylon, direct glue installation - ANSWER-Which wet carpet
floor covering would be the easiest to extract (Cat 1 | Class 1)
1. Dining Room: 50oz loop-pile nylon with #8 bonded urethane cushion
2. Living Room: 32oz cut-pile polypropylene with #6 bonded urethane cushion
3. Hallway : 70oz nylon, direct glue installation
.45360 CFH - ANSWER-You are working on a class 3 water loss that has an
affected area of 15120 CF. You plan to dry the area with a desiccant dehu. What
is the CFH?
.5-6 air movers - ANSWER-A room that is 235 sq ft. 8' high ceilings with little to
no wicking. Floor is the only area wet. What is the range of air movers you
would place?
.6-7 air movers - ANSWER-A room is 186 sqft (8' ceilings) with one offset larger
than 18" (included in the sq ft calculation).
The entire floor area is wet and walls show only minor wicking except for Wall A
and B - totaling 90 sqft
The ceiling is not affected.
What is the range of air movers you would need for this using the IICRC
calculation guide
.7 - ANSWER-If using LGRs, the water category is 3 and the cubic feet of the area
is 280. What is the minimum initial dehumidifier AHAM rated performance pint
Questions And Answers
1 AFD - ANSWER-Structure dimensions are 30' x40' x8'
According to the IICRC the desired air change rate per hour (ACR) is 4. The AFDs
you have are rated at 700 CFM.
How many AFDs will you need.
Calculation: Cubic Feet (CF) x ACH / 60 = CFM
CFM/Rated CFM= # of AFD
.1. Tightness of the building envelope
2. Prevailing weather
3. HVAC
4. Class of Water
5. Building Construction
5. Build out density - ANSWER-Favors that affect the detailed dehumidifier
calculation is:
.15
20 - ANSWER-Residential v. commercial - generally, residential ______amp /
commercial ______ amp
(consider never using over 80% of available amperage)
.2 desiccants - ANSWER-You are working on a class 3 water loss that has an
affected area of 15120 CF. You plan to dry the area with a desiccant dehu AHAM
,rated at 385 CFM. How many of these dehumidifiers do you need to install on
this project
.2 LGR dehumidifiers - ANSWER-A water supply line broke in a home affecting
the kitchen, dining room and family room. This is a class 3 Loss
Total sq ft is 1170 with 8' ceilings.
Using the information above and the simplified calculation (per IICRC), how
many 125 ppd LGR dehumidifiers would recommended as an initial deployment
to start drying the affected structure.
.2 LGR dehumidifiers - ANSWER-You are working on a class 2 water loss that has
two affected areas. Area 1 is 3750CF and Area 2 is 2700CF
You plan to dry both areas together using an LGR Dehu rated at 80 ppd at
AHAM. How many of these dehus do you need to install on this project.
.20%
16% - ANSWER-_____% rotting fungi growth IN wood
_____% - non-rotting fungi growth ON wood
.3 AFDs - ANSWER-Structure dimensions are 45' x 50' x 10'. Calculate using
4ACH. The AFDs you have are rated at 500 CFM.
How many AFDs would you need for this project?
Calculation: Cubic Feet (CF) x ACH / 60 = CFM
CFM/Rated CFM= # of AFD
, .3-4 air movers - ANSWER-The dining room is 115sq ft. 8' high ceilings with little
to no wicking. Floor is the only area wet. What is the range of air movers you
would place?
.3. Hallway : 70oz nylon, direct glue installation - ANSWER-Which wet carpet
floor covering would be the easiest to extract (Cat 1 | Class 1)
1. Dining Room: 50oz loop-pile nylon with #8 bonded urethane cushion
2. Living Room: 32oz cut-pile polypropylene with #6 bonded urethane cushion
3. Hallway : 70oz nylon, direct glue installation
.45360 CFH - ANSWER-You are working on a class 3 water loss that has an
affected area of 15120 CF. You plan to dry the area with a desiccant dehu. What
is the CFH?
.5-6 air movers - ANSWER-A room that is 235 sq ft. 8' high ceilings with little to
no wicking. Floor is the only area wet. What is the range of air movers you
would place?
.6-7 air movers - ANSWER-A room is 186 sqft (8' ceilings) with one offset larger
than 18" (included in the sq ft calculation).
The entire floor area is wet and walls show only minor wicking except for Wall A
and B - totaling 90 sqft
The ceiling is not affected.
What is the range of air movers you would need for this using the IICRC
calculation guide
.7 - ANSWER-If using LGRs, the water category is 3 and the cubic feet of the area
is 280. What is the minimum initial dehumidifier AHAM rated performance pint
