Window parts

A quick learner from Florida says:
February 3, 2021
I have 7 windows I need balancers for. Five of the windows have a stamp number of 2940 (BSI) on the aluminum rail and are 30" long and 1/2" wide. One has a stamped number of 1730 and is 18" long and 1/2" wide. The last one has a printed number of 29 9 FS CALDWELL and is 30" long and 1/2" wide. I attached some photos of the ends to help identify them.
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Casey from SWISCO responded:
February 4, 2021

Hello,

With this combination of attachments, you could have either an S380 or S385 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need 1730 and 2940 strength options for the two different balance lengths you're window have. 

Thank you and let us know if you have any other questions or concerns.



Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
18" Series 380 Channel Balance
18" Series 380 Channel Balance
S380-18
$9.34
30" Series 380 Channel Balance
30" Series 380 Channel Balance
S380-30
$11.30
25ft Bubble Seal, 3/16" x 11/32"
25ft Bubble Seal, 3/16" x 11/32"
58-135
$15.57
Winged Channel Balance Shoe, 7/8" Depth
Winged Channel Balance Shoe, 7/8" Depth
15-029
$0.82
Commercial Bubble Weatherstrip, 25ft
Commercial Bubble Weatherstrip, 25ft
58-134
$20.34
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