EditDuct Traverse Basics
This section will cover some important things regarding effective use of AiRNAB's Duct Traverse. Traverse topics will be broken down as follows:
1. Types of Traverses
2. The Importance of Hole Locations
3. Traverse Formulas
4. Printing Duct Traverses
EditTypes of Traverses
There are 3 different traverses that you can select with the Type parameter; Rectangular, Round and Oval. There are a few tricks to be aware of when setting up your traverse item on the AiRNAB equipment tree and when recording your velocity readings. We are going to address a few details here that will help ensure that your Duct Traverse report looks the way you expect it to look.
EditThe Importance of Hole Locations
How important are Hole Locations when using the AiRNAB Duct Traverse? Answer: VERY IMPORTANT!
Duct Traverse Undefined
I know that many of you are saying, "But I never put the location of the holes I drilled for my traverse on a report before. Besides, the engineer could care less anyway!" This is a true statement, however the AiRNAB system needs to know the location of your drilled holes in order to render the graphical representation of your traverse properly.
In these examples we will only be using the parameter
Hole Location 1. Rectangular traverses generally only have holes drilled on one side of the ductwork. The parameter
Hole Location 2 is used for Round and Oval traverses which we will discuss later.
If you do not define the Hole Location parameter with Top, Bottom, Left or Right when filling in a rectangular traverse the AiRNAB system will use Left as a default Hole Location. Consider the following example of a tall narrow section of duct work that you had to traverse from the top of the duct. In the example to the right we included all of our traverse information but left Hole Location 1 undefined. Notice how the graphical representation shown on this sample traverse is skewed as a result of not defining the Hole Location 1.
See how simply defining the Hole Location 1 in the same sample shown below to Top, changes the look of the traverse.
Duct Traverse Defined
It is still possible to define the Hole Location 1 in the system and not have this displayed on your Duct Traverse report. For more details on that scroll down to the last topic in this section;
Printing Duct Traverses.
Duct Traverse Left
Now lets talk about how your traverse points are distributed within your traverse graphic. We have a few guidelines to remember regarding how the traverse points will be displayed depending on which side of the duct work your holes have been drilled.
When performing duct traverses from either the Right or Left hand side of the duct work the holes are always numbered in AiRNAB from Top to Bottom as is illustrated in the report shown to the right. The readings for each row always start from the reading closest to the hole opening to the reading farthest away from the hole.In the example to the right you can see that the holes have been drilled on the left hand side and so the readings start at the left hand side of the duct and finish on the right. In the event that the holes were drilled on the right hand side of the duct the holes would still be numbered from top to bottom, however, the readings would begin on the right hand side of the duct and finish up on the left.
When performing duct traverses from either the Top or Bottom side of the duct work the holes are always numbered in AiRNAB from Left to Right as is illustrated in the report shown below. The readings for each row always start from the reading closest to the hole opening to the reading farthest away from the hole.In the example below you can see that the holes have been drilled on the bottom and so the readings start at the bottom of the duct and finish at the top. When drilling the holes from the top of the duct the holes would still be numbered from left to right, however, the readings would begin at the top side of the duct and finish up at the bottom.
Duct Traverse Bottom