Multizone HVAC System Calculator

Calculate zone damper positions and airflow for multizone systems.

Total airflow from supply fan.
CFM
Total number of zones served.
zones
This zone's load as fraction of total (0-1).
ratio

Results

Zone Airflow-CFM
Estimated Damper Position-%
Zone Duct Velocity (12" duct)-FPM
References: ASHRAE Handbook - HVAC Systems and Equipment, Chapter 19 (Multizone Systems)