FIREDRAGON
DUCT DESIGN CALCULATOR
The Firedragon Duct Design Calculator is the tool to own if you size ductwork for heating, cooling or ventilating purposes.
Our ductulator is the best and latest for sizing Hi-V or conventional ducts and has these great features:
Handy size at 5" x 7-3/4"
Round duct sizes from 3" to 100"
Rectangular duct sizes from 3" x 3" to 80" x 100"
Duct Friction Rates from .01 to 10 per 100 feet of duct
Velocity(FPM) vs Air Volume(CFM) Conversions
In addition, we've included on the back these great features:
Table 1: Recommended Maximum Duct Velocities in FPM for over 13 separate applications
Table 2: Round Duct Area = Diameter in Inches to Square Inches and Square Feet
Table 3: Design Friction Per 100 Equivalent Feet of Pipe from 50' to 400' and .05 to .50 Duct Static Pressures
A simple easy to understand way to size all of your ductwork based on your own favorites OEM's external static pressure.
This is the one to have when you're figuring a problem on air before or after it happens, why we've even thrown in 1/8" and 1/4" rulers on the front for working with floor plans and drawings.