Thanks so much Martin!
I think I'll consult some of the Mech engineers in my office about how loss is dealt with in tees.
I have a lot to learn about HVAC design (I design primarily electrical systems), but I want to see if I can do darned near everything inside the box (the box that is Revit MEP). Once I get a better understanding I'll see if I can talk more intelligently about making sure loss is taken into account for Tees (To me Tees seem like funky right angle elbows).
I was unable to get the plugin to load on startup. I am using Revit 2013. Please see the atttached image and let me know if you have any ideas....
In some cases this issue is due to Windows security. See:
The short answer may be to:
1. browse to where the .dll file is
2. right click the .dll file
3. select Properties
4. Select the General tab
5. Near the bottom, you may see: "Security: This file came from another computer and might be blocked to help protect this computer". Next to that is an 'Unblock' button. Click that.
Then, try to re-launch Revit. This solves the problem in some cases.
Read my EDIT below...l
Rather than trying to mess with ASHRAE tables and other weird Revit voodoo --- I think you’ll be better off creating a schedule that groups up all your fittings by elbow, transition, etc (turn OFF itemize each instance), and then assigning them all the same loss value (be conservative, obviously).
This will speed up your calcs, give you a very good estimate (albeit on the conservative side), and allow you to get the project done quickly. Don’t get to detailed on each individual elbow or fitting’s loss value. Unless you’re a contractor building shop drawings, you don’t need that level of accuracy (our take-offs in our firm are quite conservative, which allows for more flexible field adjustments without upsizing the fan or equipment... which can be VERY costly).
EDIT: I should point out you should only do this after you are SURE your duct systems correctly have a flow direction. If you're just randomly drawing ducts, hoping to get ASHRAE tables asigned, you'll be dissapointed. There has to be a fully complete and connected system BEFORE all the tables get worked out.
Here is a link to one of the projects I created in 2013 called "No Warnings! Hurray!" --- please don't judge the quality of design, it is just an example of a project without warnings:
You'll notice I've manually assigned the duct take offs a specific loss. There was no ASHRAE table for it even after the system was completed. But you'll see the elbows DO have ASHRAE tables.
ALSO! This is not a flat oval duct design.