Best Duct Size Calculator

How to use the Duct Size Calculator tool?

Welcome to The Chill Brothers’ Duct Size calculator. This handy tool helps you determine the appropriate duct size for your HVAC system for the best performance based on important factors like airflow and air velocity. Here’s a step-by-step guide on how to use it.

Step 1: Input the rate of Air Flow in CFM

CFM stands for cubic feet per minute and is a measure of the volume of air being moved by your AC’s compressor fan per minute. It is often given in the specifications section of your HVAC system brochure/manual/guide. 

The best way to calculate CFM, if it is not given in the specifications, is by consulting an HVAC professional, who will do all the necessary calculations. This is an important measurement that ensures your HVAC system delivers the right amount of air to maintain a comfortable environment.

Step 2: Input the air velocity in FPM

FPM stands for feet per minute. It measures how fast the air is moving through your system. In other words, CFM measures the volume of air, and FPM measures the speed. An accurate FPM value is vital for efficient and noise-free air delivery.

You can take the help of an expert and his tools to accurately measure the required/current FPM in your home, or you may put your desired FPM to calculate the size of the ducts that you might need. 

Step 3: Get the results

After you have input both values, clicking on the “Calculate Duct Size” button will give you the results for recommended duct sizes. You’ll get recommendations in the form of diameter for circular ducts and the dimensions for rectangular-shaped ducts.

Explore more helpful tools at The Chill Brothers to optimize your HVAC system. Check out our AC Size Estimator, BTU Calculator, and Energy Saving Calculator for precise calculations. These tools ensure your home stays comfortable while saving energy. Try them all for efficient heating and cooling solutions!