The mechanical engineer ensures that the HVAC design meets the exhaust and pressure levels of the LEED requirements. Also ensure that all units will receive adequate fresh air. A certain amount of air infiltration may be assumed, but the careful air-sealing associated with this credit may reduce the infiltration below expected levels. Ensure that mechanical systems, operable windows, or a combination, are able to provide enough ventilation. Make sure that pressure differences between the hallway and unit are enough to prevent cross contamination, but not so much that doors slam doors shut or are difficult to operate.
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