S380 or S385 ?

Question

Hello, could you please identify what is the model number of my channel balances? It looks like S380 or S385. They are rusty and when i try to open or close the window , they are not keeping window straight line. And most of the time it is detaching from the window frame. Do you think changing that balances are solve my problem? Window is little big and heavy I don't know if it is the problem. Please help. Thanks.

Jasmine · Accepted Answer

Thanks for posting! It does look like you have either the Series 380 with a 1" shoe or the Series 385 with a 1-3/32" shoe. To determine which series is needed for your window, look over the dimensions from the diagram below to confirm the depth of your bottom shoe. Let me know if it does not match either measurement.

You'll also need to confirm the length of the metal channel; only the metal.

Comparison of the S378, S380 and S385 balance shoes.

Once you've confirmed the series and the length, you'll need to determine the stamp option needed for your balance. Start by checking the metal channel for any stamps or markings. If there are none, you'll need to obtain the exact weight of the sash. There is a chart below the product description for each individual length that lists the weight ranges each stamp can support.

The issue you are describing with the window, is likely due to a missing or broken top sash guide. These are what guide the balance in the window channel and prevent them from shooting out of the window. Take a look at the video below for an idea on how to replace them. I'll need to see a photo of them to identify the correct replacement for them.