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1.) Define Indoor Air Quality Zones. Divide the building into separate indoor air quality <br />zones, (IAQ Zones). IAQ Zones are defined as areas of well -mixed air. Thus, each <br />ventilation system with recirculating air is considered a single zone, and each room or <br />group of rooms where air is not recirculated (e.g. 100% outdoor air) is considered a separate <br />zone. For IAQ Zones with the same construction material/furnishings and design minimum <br />outdoor air ventilation rates. (e.g. hotel rooms, apartments, condominiums, etc.) the <br />formaldehyde emission rates need only be assessed for a single IAQ Zone of that type. <br />2.) Calculate Material/Furnishing Loading. For each IAQ Zone, determine the building <br />material and furnishing loadings (e.g., m2 of material/m2 floor area, units of furnishings/m2 <br />floor area) from an inventory of all potential indoor formaldehyde sources, including <br />flooring, ceiling tiles, furnishings, finishes, insulation, sealants, adhesives, and any <br />products constructed with composite wood products containing urea -formaldehyde resins <br />(e.g., plywood, medium density fiberboard, particleboard). <br />3.) Calculate the Formaldehyde Emission Rate. For each building material, calculate the <br />formaldehyde emission rate (µg/h) from the product of the area -specific formaldehyde <br />emission rate (µg/m2-h) and the area (m2) of material in the IAQ Zone, and from each <br />furnishing (e.g. chairs, desks, etc.) from the unit -specific formaldehyde emission rate <br />(µg/unit-h) and the number of units in the IAQ Zone. <br />NOTE: As a result of the high-performance building rating systems and building codes <br />(California Building Standards Commission, 2014; USGBC, 2014), most manufacturers of <br />building materials furnishings sold in the United States conduct chemical emission rate <br />tests using the California Department of Health "Standard Method for the Testing and <br />Evaluation of Volatile Organic Chemical Emissions for Indoor Sources Using <br />Environmental Chambers," (CDPH, 2017), or other equivalent chemical emission rate <br />testing methods. Most manufacturers of building furnishings sold in the United States <br />conduct chemical emission rate tests using ANSI/BIFMA M7.1 Standard Test Method for <br />Determining VOC Emissions (BIFMA, 2018), or other equivalent chemical emission rate <br />testing methods. <br />7of19 <br />