Air Flow Unit Conversion
Choose circular tubing or rectangular piping and type the required dimension(s), then select the appropriate units.
Using the airflow calculator above, type the airflow value of
400 and select
LFM as the units. Next type the circular duct dimensions of
r = 2 in. After pressing the
Calculate Airflow button, read the CFM requirement of 34.91 CFM in the volume airflow units column.