Option for Series 380 channel
A quick learner from Orlando Florida says:
June 22, 2015
Tom from SWISCO responded:
June 23, 2015
The best way to confirm the option is to match up your current stamp to our list. If you aren't sure, or if you don't have an option, you will need to weigh your sash. We have a chart on the S380-29 store page that shows how much weight each option supports.