window channel balance
A quick learner from idaho says:
October 12, 2016
Numbers on unit 27 5 EV CMC 7
Tom from SWISCO responded:
October 13, 2016
Thanks for posting. Sounds like you have a 28" block & tackle balance with a stamp option of 2750. I'm afraid that's all I can tell based on your information, though. Now you just need to pick out the top and bottom fittings in order to determine the Series.
I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.