Sure, maybe I misunderstand the problem 
If weāre just pulling parameter values that are rounded then we donāt need the schedule data node 
Perhaps in a real life situation, you would also need to filter the elements, in the same way as your scheduleā¦
Thank you Mark, it looks like fine, when i try to create the same script as you, it shows me this:
but your solution seems to me as best
You used the wrong flatten node or you didnt tell how much to flatten.
If you want to calculate in dynamo and you have increments of 250, you could use something like this:
i think that if you have more ducts, something will go wrong
you should not be sorting
My bad⦠it works!!!
maybe i have another question, how can i create sorting and grouping in dynamo, if i hae in my schedule this:

my advice is try this:
Or adapt it to whatever fabrication sizes you have. its quite easy to calculate for Dynamo. this way it will always work 
In my example it rounds up in increments of 250ā¦
To show you the result i ran it on your file:

For me at my practice, not everyone uses Dynamo, so I quite like the idea of doing as much as possible in Revit, then using Dynamo where it brings benefit⦠So people arenāt locked out⦠Or if itās 3am and Iām not in the officeā¦
it also updates automatically without having to remember to run a graphā¦
