DOCUMENT

POL - Manual - Illinois Home Weatherization Assistance Program 2013

  • YEAR CREATED: 2013
  • ENTITY TYPE: State
  • TYPE OF DOCUMENT: POL - Policies/Procedures
This document provides information on various methods and procedures used in weatherization work, specifically related to measuring and addressing air leakage in buildings. The document starts by explaining the "Add-a-Hole" Method, which is used to estimate the total size of all the holes and bypasses in a zone being measured. This method helps identify opportunities for air sealing in the zone. The procedure involves turning off the blower door, partially opening the door or access opening between the house and the zone, and recording the new CFM50 (cubic feet per minute at 50 pascals) of the house. The zone pressure is also recorded, and the CFM50 difference is determined. Multipliers from tables are used to calculate the total leakage from the zone to the house, and the cumulative hole size in square inches is determined by dividing the total leakage by 10. The document also discusses zone pressure standards, which provide guidelines for required zone pressure readings following weatherization work. If the cumulative hole size is less than 20 square inches (200 CFM50), no air sealing is required regardless of the zone pressure reading. Another method mentioned is the pressure-pan duct test, which is used to identify duct leakage to the outside of the home. This test is conducted using a gasketed pan placed over each register or grille, with the air handler fan off and the blower door depressurizing the house. The pressure difference between the duct and the room where the register or grille is located indicates whether duct leakage to the outdoors exists. The document provides procedures for conducting the pressure-pan test, including setting up the house for winter conditions, sealing outside fresh-air intakes to the duct system, and opening unconditioned spaces as much as possible to the outside. It also explains how to use a digital manometer and record pressure readings using the pressure-pan. Standards for the pressure-pan test are also mentioned, stating that no more than half of the pressure-pan readings should be higher than 4.0 pascals, and no readings should be greater than 8.0 pascals. The document briefly mentions the duct-induced room pressure test, which measures pressure differences between the main body of the house and each room, including the combustion appliance zone. It notes that an improperly balanced air-handling system can cause comfort, building durability, and indoor air quality problems. Overall, the document provides detailed information on methods and procedures used in weatherization work to measure and address air leakage in buildings, including the "Add-a-Hole" Method, pressure-pan duct test, and duct-induced room pressure test.
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