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(800) 865-5931

Mon-Fri 8am-7pm, Sat 9am-3pm CT

This simple Duct Sizing Calculator is a slide-rule type calculator that will help you determine the appropriate size duct for your forced air heating and coooling system.  Whether designing a new duct system or improving your existing duct system this calculator can help.  Using the airflow requirements of your system and the airflow needs of a given space you can determine what size duct to choose.  The duct sizing Calculator provides results for both round and rectangular ducts.

Included Features

  • Round duct size 
  • Rectangular duct size 

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.