2023 FMC Ventilation Calculator
This calculator determines minimum outdoor airflow per Table 403.3.1.1 (2023 Florida Mechanical Code). Enter each space, pick the occupancy, area, and Ez. Results show People (Pz), then People OA, Area OA, Vbz, Ez, then Voz, and any required Exhaust.
Add Spaces
How to Read the Results
People (Pz): Area × Density / 1000 (can be fractional).
People Outdoor Air: Rp × Pz.
Area Outdoor Air: Ra × Area.
Vbz: People Outdoor Air + Area Outdoor Air.
Ez: Zone air distribution effectiveness selected for the space.
Voz: Vbz ÷ Ez.
Exhaust: Exhaust rate per ft² × Area (only where table requires it).
Note: Simplified single-zone. For multi-zone and system ventilation efficiency (Ev/Er/Et) and Vot, see FMC 403.3 and ASHRAE 62.1.
