which balance to order?

Question

I have a Milgard double hung window that does not tilt out. The balance stamp says:
20 4 EW CMC 11. The balance is 21" long. There are a couple of shoes that look similar but since they are attached I can't get great measurements. I think it's a 21" 380 Channel or possibly the 385. Can you help me order the right part? Thanks

Casey · Accepted Answer

Hello,

I agree that with this combination of attachments, you could have either an S380-21 or S385-21 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 2040 spring strength options for your replacement balances.

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

Comparison of the S378, S380 and S385 balance shoes.