zDuctulator1.0

zDuctulator is a simple to use utility
designed for engineers, sheet metal
workers, HVAC professionals, and
students.

• Quickly size duct
• Automatically sizes duct branches
• and mains from a list of CFM
• values
• Easily review duct properties (CFM,
FPM, SP, & Aspect Ratio)

zDuctulator includes:

• A fully functional ductulator for sizing
• and designing HVAC systems
• A reference table for low pressure
and medium pressure duct sizes
• A CFM counter to size duct mains
and branches
• An easy to use hyperlinked help file

1.0 Ductulator

The ductulator can be used to easily find
either the equivalent diameter or the
equivalent rectangular sizes of duct. As
the size updates, the velocity (FPM), the
volume (CFM), and the friction loss (SP)
will also update automatically.

1.1 Equivalent Diameters

To find the equivalent diameter, enter the
Width and Depth dimensions of the
rectangular duct. The Diameter will update
automatically.

1.2 Rectangular Equivalent

To find the rectangular equivalent, enter
either the Width or Depth dimensions first,
then enter the Diameter. If you enter
he Depth first then the Diameter, the
Width will update. If you enter the Width
first then the Diameter, the Depth will
update.

1.3 Lock Buttons

The lock buttons allow you to lock either
the CFM value or the FPM value when
sizing duct. For example if you are sizing
duct based on a certain velocity, you can
lock the FPM value to get more accurate
information about the duct size. If you
are sizing duct to a specific volume, you
can lock the CFM value instead.

1.4 Aspect Ratios

The Ratio below the FPM indicates the
aspect ratio of the current rectangular
duct size. If the aspect ratio exceeds
3:1, the Ratio text as well as the Width
and Depth size text will display red as
a warning to review and revise the
rectangular size if possible.

2.0 CFM Counter

The CFM counter is a tool to quickly
total CFM for diffusers and get the
correct branch and main sizes to
design the system.

2.1 Set Friction Loss

To begin using the CFM counters, set the
friction loss (SP) at the top of the screen.
0.08 Is used as the default value.

2.2 Enter CFM

Enter the CFM for each diffuser, air device, or terminal, and
the Diameters for the branches will be
automatically calculated. The CFM for
the system will also be totaled and the
Main Duct size will be calculated in the
row above the first branch CFM.

2.3 Reset All Values

Click the RESET button to reset all
values to 0. The RESET button is at
the top right of the CFM+ screen.

3.0 Size Table

The Size Table is a quick reference
of low pressure and medium pressure
duct sizes and properties.

4.0 Value Ranges

For speed and simplicity, there are
value ranges for each data type that
can be freely entered.

4.1 Size Value Ranges

Width
Min: 1
Max: 500

Depth
Min: 1
Max: 500

Diameter
Min: 1
Max: 240

4.2 Setting Value Ranges

CFM
Min: 1
Max: 19573255

FPM
Min: 1
Max: 12000

Glossary
Ductulator - A Ductalator is an engineering
tool used by Sheetmetal workers, mechanical
engineers, and HVAC professionals to size
rectangular duct, size round duct, find CFM,
find FPM, & find friction loss. Typically
ductalaters are printed dial calculators
like the "Trane Ductulator" or the "Cook Duct
Designer". Ductulators are also known as
Duct Size Calculators, HVAC Tools, Duct
Designers, Duct Size Finder, CFM Finders.