Tom from SWISCO responded:
July 24, 2018
Thanks for posting! Can you confirm the length of the metal channel? Based on your stamp of 3940, the length should be 40". If it is 40" long, I recommend our S395-40 with a 3940 option. But if it is 33", see our S395-33. It may have been cut down by the installers for whatever reason. You'd have to weigh your sash on a scale to confirm the best S395-33 stamp option. |