SWISCO - The Replacement Hardware Authority

Sun Air window Balance replacement

A handy person from CA says:
I have a Sunair window Balance w/2740 B.S.I stamped on it. I am a bit confused as to which series to get 350, 380 they all seem to have the same specs and end pieces. Thank you.
Profile picture of Donna
Donna from SWISCO responded:
Good Afternoon,

A lot of the channel balance series do look very similar but there are differences between the balance attachments. The balance attachments are the plastic (sometimes other materials) attachments found on the bottom and top of the channel balance. If you need help choosing the replacement channel balance series that matches your existing balance, please submit a couple pictures of your channel balance's attachments. We can help you choose the proper balances series based on your pictures.
A handy person says:
I have attached the photos.

Thanks
User submitted photo of channel balance attachments.
Profile picture of Mike
Mike from SWISCO responded:
Does your bottom shoe have wings like the 15-005 shoe or does it look more like the 15-002?
A handy person from ca says:
It has wings like the 15-005
Profile picture of Mike
Mike from SWISCO responded:
Can you confirm the length of the channel portion of your balance? I think it may be 28" in length.
A handy person from ca says:
Yes, It is 28" in. long
Profile picture of Mike
Mike from SWISCO responded:
This appears to be the S350-28 Channel Balance with the stamp option 2740.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)