Tom from SWISCO responded:
December 10, 2012
Thanks for posting! I can just make out the stamp on your metal channel. It looks like its 27 4. I assume that that is of the 28" balance, correct? If so, for that one, I would recommend the 2740 option. However, you should weigh your sash and compare that weight to the strength listed for the 2740 option.
As for the smaller balance, I'm not sure what option you need without seeing the stamp. That said, you can always weigh that sash, too, and compare it to the options listed for the S385-25. |