Set CFM Total

This section describes how to set the total CFM for a room, duct, or multiple diffusers.

CFM Setting Adjustment Methods

The methods by which CFM values can be adjusted for existing diffusers are described below.

Average CFM in Diffusers: The total airflow is divided evenly between all the diffusers. Each diffuser will have the same airflow.

Prorate CFM in Diffusers: The total airflow is prorated among the diffusers based upon their current airflow. The relative airflows will remain the same between the diffusers. Different diffusers will have a different airflow.

Example: You have chosen to set the CFM total for two diffusers. The first currently has 100 CFM, and the second has 200 CFM. You set the new total for the two diffusers to 450 CFM. The first diffuser will have 150 CFM, and the second diffuser will have 300 CFM.

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