Want to know how to use Ductulator.com?
    1. Enter duct sizing criteria:
         - Maximum air velocity
         - Maximum air pressure drop per 100 ft
    2. Enter design airflow (CFM).
    3. Use any of the duct sizes shown.    
    4. If desired, adjust duct size by clicking up or down arrow.

    
    Need to add up multiple airflow values?
    - Press enter after placing cursor in the CFM box. Start typing numbers with "+" sign then press "Enter". 
    - Website will calculate total airflow and type it in the CFM box.
    

    Have questions, suggestions or want to report hidden bugs?
    Contact me at support@ductulator.com , emails are reviewed in a timely manner.

    Happy Duct Sizing!

    Miro