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IICRC - Applied Structural Drying Verified Questions And Answers
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IICRC - Applied Structural Drying Verified Questions And Answers IICRC - Applied Structural Drying Verified Questions And Answers
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IICRC - Applied Structural Drying Verified Questions And Answers Air Filtration Device (ADF) Commonly called an air scrubber or negative air machine if airborne particles need to be reduced, you could use an appropriately installed _______ ________ ________ Air Filtration Device AFD Assembly Construction Prior to determining the best drying system for affected materials, restorers should identify and understand the assembly construction (ie wall assembly, floor assembly) Category 1 water originates from a sanitary source and does not pose substantial risk for dermal, ingestion, inhalation, or exposure. Uncontaminated and routinely cleaned Category 2 water contains significant contamination and has the potential to cause discomfort or sickness if contacted or consumed by humans Category 3 water is grossly contaminated and can contain pathogenic, toxigenic, or other harmful agents Sewage Back Up Category 3 Clean water supply line Category 1 Class 1 Least amount of water absorption and evaporation load - Wet porous materials - water loss is less then 5% of the area Class 2 Significant amount of water absorption and evaporation load - water intrusion where wet represents 5% - 40% of the area. Class 3 greatest amount of water absorption and evaporation load. Water intrusion where wet represents over 40% of the area Class 4 deeply held or bound water. Significant amount of water absorption into low evaporation materials. Drying may require special drying methods, longer drying time, or substantial water vapor pressure differentials. Closed drying system Uses mechanical dehumidification and is not open to outside air. Used if there are security issues, the outside air is not conductive to drying or when access to outside air is not possible. Conventual refrigerant dehumidifier Removes water vapor from the air by lowering the temperature of the incoming air to below dew point and causing the water to condense on the coils. Cold and hot surfaces created with gases inside a closed coil system. Combination Drying System uses some outdoor air with dehumidifiers to accelerate the drying process. This can include periodically venting (flushing) the structure, using negative pressure or using small openings to the outside Desiccant dehumidifier Removes water vapor from the air through absorption. Usually requires more amperage as compared to refrigerant dehumidifier. Desiccants create the lowest vapor pressure which work best on low porosity materials. When a desiccant dehu is drawing outside air and ducting processed air inside a building it can create positive pressure in the building. To improve desiccant dehu performance, it may be beneficial to pre -cool the desiccants air intake Infiltration High humidity outside air could affect the drying climate adversely due to ______________ 1. Tightness of the building envelope 2. Prevailing weather 3. HVAC 4. Class of Water 5. Building Construction 5. Build out density Favors that affect the detailed dehumidifier calculation is: Detailed Dehumidification Calculation See Chart: Cubic Feet : Divided by 70 = Base Pints per day Multiply the 5 multipliers together: Build out density x building construction x class of water x HVAC x Weather Impact = Multiplier Multiply Base Pints per day x Multiplier = Adjusted Pints Per Day Dry Standards The unaffected material readings are called ______ ______. You know you can use this as your drying goal. Your drying goal is this plus 10% of it. Drying Goal Calculation Dry standard + (Dry standard x 10%) = ____________________ Why does demolition occur 1. Removing Materials to eliminate safety hazards 2. Removing materials that have suffered primary damage and are not restorable 3. Removing porous materials that are holding odor 5. Removing vapor barriers to assist with drying efforts 6. Removing materials to reduce drying time 7. Removing materials to open cavities or areas to provide additional needed servicesVoordelen van het kopen van samenvattingen bij Stuvia op een rij:
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