Attached photos of window balancer, I beleive the windows were made by Alcan in the mid 90's. The ones I need right now are 3450's I'm not certain of the series, I attached photos. I also need to get a few more of the clips that attch to the side of the window. If you need any other info to help identify the correct part please let me know.
Thanks-Scott
Balancers
Home Owner from Central Florida
Oct 13, 2025 9:03 am
5 user uploaded images
5 Replies
Casey from SWISCO
Oct 17, 2025 9:30 am
Hello,
Your channel balance resembles the S378-35 (3450 option) replacements at first glance. Take a look and confirm the 7/8" deep bottom fitting matches yours.
How to measure the length of the Series 378 channel balance
Close up view of the S378 balance shoe
As for the top sash guide, the 18-161 would be a good place to start. Take a look at the specifications below to ensure they match your part. Thanks for posting!
Detail of 18-161
Profile view of 18-161
Home Owner from Central Florida
Oct 17, 2025 9:55 am
Thank you. So I have different heighth windows with different weights and lengths but the balancers are effectively the same otherwise. Is there a series number or how would I know for example what babalncer I would need if the length was say 29 instead of 35? The measurements you provided match up so I think thats the right part number for the balancer I posted, but I have shorter windows I will also want to replace soon.
Home Owner from Central Florida
Oct 17, 2025 9:59 am
disregard my last question I found it, thanks for your help!
Casey from SWISCO
Oct 17, 2025 10:16 am
It sounds like you were able to find the S378-29 balance, but we'll be here if you have any other questions!
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