Marvin balancers for replacement

Home Owner from Santa Rosa, CA
Older single hung aluminum double pane window, need replacement. Windows old enough no numbers/model stenciled on window. Total length balancer 28" aluminum 27 inches. Do I need to weigh window or is this enough?
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Emily
Emily from SWISCO
SWISCO
Expert

Hello there!

Thanks for reaching out to us. You don't have to weigh the window. We're happy to look into this but can you also show us a photo of the inside of the metal channel where the innerspring connects to the pulley mechanism? That'd be located in the middle of the channel.

Home Owner from Santa Rosa, CA
Follow up photos to Emily
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Emily
Emily from SWISCO
SWISCO
Expert

Thank you kindly! Based on your uploaded photos, you can use the S380-27 or S385-27 with the 2640 stamp option. The difference between these two Series is the depth of the bottom shoe so you'll have to measure as shown below. 

Let me know if you have any questions! 

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.

Home Owner from Santa Rosa, CA
Thanks! Great service
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