With the Duct Wizard you can determine proper duct size in seconds!
Calculate duct size instantly with the Duct Wizard! This hand-held rotating calculator makes sizing supply and return duct systems a cinch! Along the side are handy 1⁄4" ruler markings; back has the reference charts and tables you use every day!
On one side you'll get the proprietary rotating duct calculator, complete with the tools you need to:
- Establish Air Quantity (CFM) and Friction Loss
- Set Air Quantity (CFM) opposite of Friction Loss
- Read Velocity (FOM) opposite of Air Quantity (CFM)
- Read Duct Diameter, Equivalent Regular Duct Dimension, and more!
On the opposite side, you'll find an at-a-glance guide to the reference charts and tables you rely on every day, including the following and more:
- Commonly Used Fittings and Connections
- Round Trunk Duct Fittings
- Angles and Elbows for Trunk Ducts, Individual and Branch Ducts
- Boot Fittings
- Basic Air Conditioning Formulas (cooling, heating and/or humidifying)
- Formula Legend
- Derivations of Air Constants
- Recommended and Maximum Duct Velocities
- Recommended Gauges for Sheet Metal Ducts
- Gauges and Data for Average Local Exhaust Systems
Example
Given: 300 CFM @ .08 Inches of Water per 100 ft.
Find: Size of Round Duct, Velocity, Equivalent Duct Dimensions.
Solution:
- Read Velocity @ 650 FPM
- Read Duct Diameter @ 9.2"
- Read Duct Dimensions 6" X 12" or 5" X 15"
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