// multi-utility computation suite · offline · instant · precise
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build.hvac-airflow Calculator
Calculates required airflow (CFM) for a space from volume and target air changes per hour (ACH), and sizes the ductwork to deliver it. Medical exam rooms require 6 ACH; standard offices need 4–6 ACH; labs with fume hoods require 10+ ACH.
Inputs
Room Volume M3
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Ach
Reference formula or conversion factor shown for context.
Occupants
Reference formula or conversion factor shown for context.
Cfm Per Person
Reference formula or conversion factor shown for context.
Results
required airflow (m^3/hr)
Reference formula or conversion factor shown for context.
required airflow (CFM)
Reference formula or conversion factor shown for context.
occupant-based (CFM)
Sample size or count used in the calculation.
use the larger value (CFM)
The computed numeric or monetary value.
air changes per hour
Sample size or count used in the calculation.
ASHRAE 62.1
Reference formula or conversion factor shown for context.