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WRT QUESTIONS AND ACTUAL ANSWERS UPDATED
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WRT QUESTIONS AND ACTUAL ANSWERS UPDATED
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WRT QUESTIONS AND ACTUAL ANSWERSUPDATED 2024 - 2025
Category 1 ANS -1 (previously known as "clean") - originates from a sanitary water source
Category 2 ANS -(previously known as "gray") - contaminated; potentially causes discomfort or sickness
Category 3 ANS -(previously known as "black") - grossly contaminated; includes toxins, pathogens
• Regulated or hazardous materials and mold ANS -(creating special situations) - IEP recommended
Class of Water ANS -(quantity; anticipated evaporation rate; initial dehumidifier calculations)
Class 1 ANS -- (least amount of water, absorption and evaporation) wet less than ~5% of combined floor,
wall, and ceiling surface area - minimal moisture absorption into the materials
Class 2 ANS -(large amount of water, absorption and evaporation) wet between ~5 - ~40% of combined
floor, wall, and ceiling surface area - minimal moisture absorption into the materials
Class 3 ANS -- (greatest amount of water, absorption and evaporation) wet more than ~40% of
combined floor, wall, and ceiling surface area - minimal absorption into the materials
Class 4 ANS -- (deeply held or bound water) - (e.g., hardwood; lath and plaster; concrete) - water hidden,
trapped, or bound in low evaporation assemblies; requires controlled drying techniques, low vapor
pressure, specialty equipment probable
Principles of Drying ANS -Remove excess / Evaporation / Dehumidification (ventilation) / Temperature
control
Extraction tools: ANS -Light wand - perimeter of water loss; extract glue-down carpets; follow-up
extraction-stationary tool • Stationary tool (e.g., Water claw; Flash Xtractor) - subsurface tool; extract
,carpet/cushion together • Self-propelled tools (e.g., Rover; Xtreme Xtractor) -self-propelled riding tool;
multi-speed; extract carpet and cushion • Vacuum squeegee - concrete; hardwood; vinyl; laminate •
Submersion pumps - Formula - (ft2 x inches deep) ÷ 12" = ft3 water x 7.48 = water volume
Evaporation tools ANS -Airmovers - centrifugal (laminar); axial (high-amperage; low-amperage; focus
ability) o placement -5-45 degree focus; almost touching wall; always round up to next number § Initially
one airmover each affected room
• Airmovers ANS -centrifugal (laminar); axial (high-amperage; low-amperage; focus ability) o placement -
5-45 degree focus; almost touching wall; always round up to next number § Initially one airmover each
affected room § Additionally, add one: • Every 50-70 sq. ft. wet floor and walls up to 24 inches high •
Every 100-150 sq. ft. of affected wet ceiling and walls over 24 inches high • Each wall offset greater than
18 inches o One per 14 LF of all only (if only lower wall and limited flooring) o One per small areas under
25 sq. ft. if upper walls and ceilings not affected o safety screens - intake and output areas; clean with
compressed air; do not block intake o electrical safety - lightweight extension cords; three-prong plugs;
electrical cord safety
Structural Cavity Drying Systems (SCDS) ANS -Vented-ducted (e.g., Turbovents 18"-48" widths; Octi-dry;
Air Wolf) o injected (e.g., Injectidry; Dri-Force; Omni-dry; Direct-it In)
Floor Drying Systems ANS -vented (e.g., Air Wolf) o injected - negative air mats/panels (e.g., Dri-Force;
Injectidry) o air-blanket style
Air Filtration Devices ANS -AFDs (negative air machines - NAM; air scrubbers; HEPA filters)
Dehumidifier Ranges ANS -Understanding where temperature, RH, and GPP ratings are out of working
ranges
AHAM rating: ANS -pints removed at 80º F / 60% RH in 24 hours
Refrigerants ANS -Most efficient operating conditions 70º - 90º F. (most energy efficient is an LGR)
, Desiccants ANS -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.
Uses ANS -closed-drying environments; multiple layers of materials; security limitations; high outside
(and inside) humidity conditions; no ventilation ports; basement areas
Initial dehumidification recommendations ANS -(psychrometric readings dictate requirements after first
day)
Inspection equipment: ANS -Moisture sensor
Thermo-hygrometer
Moisture meters
infrared camera and thermometer; manometer; borescope; data logger
Moisture sensor ANS -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 ANS -- 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 ANS -- invasive and non-invasive; determines moisture content; establish, monitor and
determine when dry standards are met
Miscellaneous ANS -- infrared camera and thermometer; manometer; borescope; data logger
Chemicals / biocides (antimicrobial biocides) and industry acronyms ANS -Sterilizer; disinfectant;
sanitizer • Written informed consent to customer; advise occupants to leave during application;
document • HEPA - High Efficiency Particulate Air (99.97% capture rate of particulates at .3-micron size)
• Government-registered disinfectants - document application details; apply only per label directions •
EPA - Environmental Protection Agency (U.S. federal agency with regulatory control over biocides) •
F.I.F.R.A. - Federal Insecticide, Fungicide and Rodenticide Act - U.S. federal regulations administered by
EPA
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