Issue link: https://hi.iaq.net/i/630729
48 Section 6 to describe the operating schedule of equipment. Obvious problems (e.g., blocked diffusers, malfunctioning air handlers) can be corrected to see if the complaints disappear. The walkthrough can solve many routine IAQ problems and will suggest directions for a more complex investigation, should one be necessary. Some investigators avoid taking any measurements during the initial walk- through so that they are not distracted from "getting the big picture." Others find that using smoke sticks, digital thermometers, and direct reading CO 2 meters or detector tubes to take occasional measurements helps them develop a feel for the building. It may help to keep the following questions in mind during the initial walkthrough: Are there obvious pollutant sources? Do they appear to be adequately controlled? ■ Are pollutant indicators present, such as odors, excessive dust, or staining? ■ Are there sanitation problems (e.g., debris near outdoor air intake, visible mold growth, major water damage) that could be introducing air contaminants? ■ Are there any conditions or activities occurring in or near the building that could be related in timing, location and health effects to the complaints? Are there any deficiencies in the HVAC system that serves the complaint area? ■ Does equipment serving the area (e.g., thermostats, diffusers, fans, dampers, filters) appear to be operating, clean, and in good condition? ■ Do operating procedures exist, and does the staff follow them? ■ Do records indicate that the system was commissioned (set, tested, and balanced) after construction? ■ Do records indicate that system compo- nents are regularly inspected, calibrated, and adjusted? This improvised catch basin is intended to collect water seeping into the building from below grade. Although the catch basin "solves" the prob- lem of uncontrolled water leakage, it also provides an indoor location that could support the growth of microbiologicals and create IAQ problems. Identify key individuals needed for access and information. A person familiar with the HVAC systems in the building should be available to assist the investigator at any time during the onsite phase. Individuals who have complained or who are in charge of potential sources (e.g., housekeeping, non- HVAC equipment) should be aware that their information is important and should be contacted for appointments or telephone interviews if they will not be available during the onsite visit. The initial walkthrough provides an opportunity to question complainants about the nature and timing of their symptoms and to briefly examine the immediate area of the complaint. The investigator attempts to identify pollutant sources and types and observes the condition and layout of the HVAC system serving the complaint area. Facility staff can be asked