Paul from SWISCO responded:
April 22, 2014
Thank you for posting! I agree, the Series 140 looks like a good match. As for the weight of the sash, your best bet would be to weigh it on a scale. Alternatively, you can check the coil springs themselves for any stamps.
I would not go for a stronger spring than what is required to lift the sash. You don't want them to be too strong. |