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Duct Diameter
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Data Source and Methodology
All calculations are based on the ASHRAE Fundamentals Handbook.
The Formula Explained
The duct diameter is calculated using the formula:
Diameter = (Airflow / (Velocity × π / 4))^0.5
Glossary of Variables
- Airflow (CFM): The volume of air flowing through the duct per minute.
- Friction Loss: The pressure loss due to friction in the duct.
How It Works: A Step-by-Step Example
For an airflow of 1000 CFM and a friction loss of 0.1, the calculated duct diameter is 10 inches.
Frequently Asked Questions (FAQ)
What is the equal friction method?
The equal friction method is a technique used in HVAC design to size ducts based on a constant pressure loss per unit length.