We strive to develop intuitive applications needing little or no "documentation". However, if used without introduction some of the power and features available from the main sizing view might be missed.
Main Sizing View
In the above screenshot two areas are visible:
Top - Outputs including size, airflow (cfm) and velocity (fpm).
Middle - Dynamic Inputs. Enter values directly or use sliders to determine / vary duct sizes displayed up top.
Scrolling down reveals more:
Static Inputs - the above screenshot has Inputs of a static nature: duct material, shape, purpose, etc.
Top Output Area
The really small top line stating "Sizes are exact dimensions" Indicates displayed sizes are exact with respect to inputs. Select "Even" or "Odd" to round up sizes to the next nearest size of commonly available duct material. The "Even" message is "Sizes rounded up to even inch numbers"
Displayed Dimensions - The dimensions for rectangular ducts show width and height outside the rectangular duct outline. Inside is airflow and velocity. If the selected duct shape is round a round outline is displayed with duct diameter outside the circle.
Equivalent Diameter - whether round or rectangular is selected this always displays the duct round size equivalent.
When rounding odd or even there are many solutions and numbers will not always change. For you to know that something is actually happening the bottom line always displays the "Exact" dimensions and solutions regardless of the selected shape, round, rectangular, or oval. If needed you can look at the values to see when you are approaching the next two inch increment.
There are two main solution modes:
"By Airflow" Solves duct sizes given input airflow (cfm), friction (in/100') or velocity (fpm). Airflow is always displayed, Friction and Velocity toggle by tapping and selecting the button. If your duct is rectangular or oval you may also specify width to height (w:h) ratios from 0.1 to 10 with a ratio of 1 creating a square duct.
"By Size" solves duct velocity, friction, airflow given duct size and airflow or friction which is often the case for existing installations. To solve for a velocity given either airflow or friction move the sider until the desired velocity is displayed.
For either mode By Size or by Airflow: to toggle friction, velocity (by airflow as shown) or to toggle airflow, friction (by size) press the input type button:
Duct Material Type
Select material type:
Select the purpose from the list. Once selected a table lookup is made based on the material (i.e. Flex, Steel) and the purpose to find recommended (Base) and Maximum (Max) velocities.
If your velocity is below the Base velocity is White. If velocity is above Base and below Max velocity is Yellow. Velocities above Max appear Red.
Should you require custom Base and Max values select "Custom - Enter Values" from the list. You will then be able to edit these values.
Comments and Group Tags
Comments: Enter any reference to help remember this calc.
Group Tag: When you enter the same value in one or more duct calculations, all calculations are grouped in the same section in the List view:
The above all have a Group Tag of "#House One"
When creating PDF reports the selection of ducts for the report is by Group Tag.
Pressing the "List" button at the top left of the main calculation view brings you to the List View:
Use List View to manage calculations. From the toolbar press Edit to delete with the "Edit" Button or press Add new values with "Add" button . From any mode you can Swipe your finger across a cell to delete.
Press "Delete" to confirm. Once deleted values may not be recovered.
Any added calculations take on the values of the currently selected calculation in effect producing a new copy.
Pressing the "Settings" (Gear) button at the top right of the main calculation view brings up the Admin View:
Units Of Measure
To select all of a type, i.e Imperial or Metric at the top "Units" row press Imperial or Metric. All values are immediately reset. From there you may change any one value without changing others.
Scroll down in the view to define air properties:
Reports are PDF files created from Groups. The group that the currently selected duct calculation is in is automatically selected for the report.
Once you are satisfied with your group press "Preview and Email/Print":
From this view select the Send button at the top right to Email, Print, etc.
Docs and Support
Docs and Support takes you to this page.
If you are happy with HVAC Buddy Duct Calc Pro please rate it in the AppStore!