Additionally, paste this code immediately after the opening tag:

HVAC Buddy® Duct Calc

The best and number one selling duct sizing tool for Android devices with thousands of happy users. For less t...

$ 9.99

Store review

The best and number one selling duct sizing tool for Android devices with
thousands of happy users. For less than the cost of a cardboard wheel
ductulator always have a fast, accurate way to analyze ducts for design (by
Airflow) or existing installations (by Size).

Airflow Tab

Calc decimal & rounded sizes for any aspect ratio

Solve for Volume, Aspect Ratio, Friction, or Velocity

Size Tab

Calc Friction and Velocity given duct size

Settings Tab:

Enter various units - Airflow (cfm, m3/s, l/s, m3/hr) Friction (in/100',
Pa/30m), Duct Sizing (in, cm), Velocity (ft/min, m/s)

Define standard air - Altitude (ft, meter), Temperature (Fahrenheit,
Celsius), Relative Humidity (pct)

Displays calculated Kinematic Viscosity (ft2/s) and Specific Volume (ft3/lb)

Material Types:

PVC

Aluminum

Galvanized Steel

Spiral Steel

Smooth Liner

Fiber Liner

Flex Duct

Duct Shapes:

Round

Rectangular

Oval

Duct Sizing

Round to Even Units

Round to Odd Units

Calculations are based on friction loss equations in the ASHRAE Handbook of
Fundamentals 2009.

@Rick the reviewer:

-----------------------------------------
A 12x12 duct matches FPM and CFM when friction is ignored which cannot happen
in real life. This relationship changes based on the properties of air (see
kinematic viscosity on the settings tab) and on the friction value determined
via the type of duct selected. Also, for the times when you want to get
friction given CFM and Duct use the "Airflow" tab, select the "ft/min"
checkbox and move the slider accordingly. There are many ways to drive the
open variable.

Accuracy:

-----------------------------------------
Calculations have been verified against ASHRAE fundamentals and several other
references. There are more input criteria (such as duct material) than
velocity, friction, and size mentioned in the review which the reviewer may
not have taken into consideration. Use the Support email link for any
questions or concerns.

Other HVAC Buddy Applications:

-------------------------
NEW!

HVAC Buddy® Load Calc - Improve accuracy when sizing equipment, demonstrate
professionalism on the job, and add substance to your proposals by using our
heat loss and heat gain calculation app.

HVAC Buddy® Load Calc (Apple) - Also available on iOS devices - iPhone, iPad

HVAC Buddy® - Refrigerant charging and diagnostics.

HVAC Buddy® Pressure Temperature - Traditional PT Chart with 71 Refrigerants
in Metric or Imperial units

Store rating

3

out of

22 reviews

Last update

Feb. 15, 2013

Read more