Florida Mechanical Code Chapter 4 Section 403, Balancing the Ventilation of a Building or Tenant Space.
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These regulations outline the mandatory engineering standards for designing and installing mechanical ventilation within various building types. Systems must maintain a balanced airflow, ensuring that the volume of incoming fresh air roughly matches the air being exhausted or returned. Designers are required to calculate minimum outdoor airflow rates based on the specific occupant density and the primary activities occurring within a space. While standard calculations are provided for most environments, bespoke engineering analyses are necessary for unique scenarios or areas where tobacco smoke is present. Ultimately, these rules ensure that breathable air is consistently delivered to all occupants throughout the duration of a building's use.