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eng.HVAC-ventilation-ASHRAE62 Calculator
Calculates outdoor air ventilation requirements per ASHRAE 62.1 ventilation rate procedure from occupancy and floor area data. The ventilation effectiveness factor (Ez) adjusts the outdoor air requirement for air distribution effectiveness — mixing ventilation uses Ez = 1.0.
Inputs
Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Occupants
Reference formula or conversion factor shown for context.
Ra L S Person
Reference formula or conversion factor shown for context.
Rz L S M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Ez
Reference formula or conversion factor shown for context.
Results
zone outdoor airflow Voz (L/s)
Sample size or count used in the calculation.
breathing zone outdoor air Vbz (L/s)
The value at the specified point or condition.
air changes per hour ACH
Sample size or count used in the calculation.
Vbz = Ra·P + Rz·A
Reference formula or conversion factor shown for context.