Blomberg Window spring assembly

Question

I have a Blomberg double hung aluminum window that was installed about 30 years ago. The side spring mechanism has broken, and I would like to replace it. Can you help me get the correct part? The window is 4-feet x 4-feet. See the attached .pdf for some images of the part. It is 23-inches long. The spring is 10-inches.

Thank you for your help with this matter.

Mario

Thank you for your help with this matter.

Mario

Casey · Accepted Answer

Hello,

I agree that your balance resembles the S390-22 as long as the 1-1/8" depth matches yours. As for the strength option, your stamp would normally indicate that you need 2140 options but they will be calibrated to support a sash between 15-23 lbs. If your sash weighs exactly 25 pounds, you would need 2150 options to support a 23-27 lbs sash. Take a look and thanks for posting.

Close up view of the S390 balance top.

Close up view of the S390 balance shoe.