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Department of Public Health, Richmond, CA. https://www.cdph.ca.gov/Programs/CCDPHP/ <br />DEODC/EHLB/IAQ/PagesNOC. aspx. <br />For the outdoor air ventilation rate I used the 2019 Title 24 code required mechanical <br />ventilation rate (ASHRAE 62.2) of 106 cfm (180 m3/h) calculated for this model residence. <br />For the composite wood formaldehyde emission rates I used the CARB ATCM Phase 2 <br />rates. <br />The calculated maximum number of square feet of composite wood product that can be in <br />a residence, without exceeding the CEQA cancer risk of 10 per million for occupants with <br />continuous occupancy are as follows for the different types of regulated composite wood <br />products. <br />Medium Density Fiberboard (MDF) — 15 ft2 (0.7% of the floor area), or <br />Particle Board — 30 ft2 (1.3% of the floor area), or <br />Hardwood Plywood — 54 ft2 (2.4% of the floor area), or <br />Thin MDF — 46 ft2 (2.0 % of the floor area). <br />For offices and hotels the calculated maximum amount of composite wood product (% of <br />floor area) that can be used without exceeding the CEQA cancer risk of 10 per million for <br />occupants, assuming 8 hours/day occupancy, and the California Mechanical Code <br />minimum outdoor air ventilation rates are as follows for the different types of regulated <br />composite wood products. <br />Medium Density Fiberboard (MDF) — 3.6 % (offices) and 4.6% (hotel rooms), or <br />Particle Board — 7.2 % (offices) and 9.4% (hotel rooms), or <br />Hardwood Plywood — 13 % (offices) and 17% (hotel rooms), or <br />Thin MDF — 11 % (offices) and 14 % (hotel rooms) <br />Clearly the CARB ATCM does not regulate the formaldehyde emissions from composite <br />wood products such that the potentially large areas of these products, such as for flooring, <br />baseboards, interior doors, window and door trims, and kitchen and bathroom cabinetry, <br />18 of 19 <br />