Channel balances : SWISCO.com

Quick Learner from Los Angeles

Apr 26, 2026 12:07 pm

I live in near LAX. I have double windows. The channel balances are marked BSI 2540 and 2530 rf. The metal part is 26" long. They are 1/2 wide channels that are 9/16 thick. What is the right balance to replace these?

4 user uploaded images

4 Replies

Bob from SWISCO

Apr 26, 2026 11:17 pm

Hello there. Can you show me the bottom attachment, or shoe, actually out of the window? I need to confirm it lacks 'wings', or side tabs. That should narrow this channel balance's identity down!

Quick Learner from Los Angeles

Apr 27, 2026 10:09 am

Here is the bottom

1 user uploaded image

Bob from SWISCO

Apr 27, 2026 3:04 pm

Perfect, thanks. This looks like it might be the S390-26 or S351-26, depending on the depth of the bottom nylon shoe. See below. Measure your old balance's shoe depth to see what matches best. For a stamp option choose 2530 and 2540, respectively.

Comparison of the S351 and S390 balance shoes.