![]() ![]() trap for drains subject to negative static PĮnvelope controls for water an air intrusionĭesign to prevent indoor condensation Air Quality Classification Return, transfer classification pan required underneath condensate-producing coils Min OA must exceed maximum exhaust Systems and Equipment Requirements - Controlling Moisture to Prevent Microbial Growth Wet coil drain pans Relative humidity 65% max to limit allergen and pathogen growth Local - observe building site and surroundings during expected operating hours for sources Systems and Equipment Requirements Provide combustion air as neededįiltration of at least MERV 8 upstream of cooling coils and other wetted surfaces that supply air to conditioned space Regional-National Primary Ambient Air-Quality Standards ![]() Accetable Indoor Air Quality Definition Air in which there are no known contaminants at harmful concentrations as determined by cognizant authorities and with which a substantial majority (80% or more) of the people exposed do not express dissatisfaction Outdoor Air (section 4) Investigation of OA quality required
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