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That perception part is enough to scare most people away even if they can get it through the AHJ. Nothing like having to go back and redo your design because the client and/or AHJ just doesn't think the air is clean enough. In my opinion your safety net just isn't there like it is if you follow the ventilation rate procedure.6.3.1.3 said:The criteria to achieve the design level of acceptability shall be specified in terms of the percentage of building occupants and/or visitors expressing satisfaction with perceived indoor air quality