Milestone window balances

A home owner from UK says:
Hello- I need some channel balancers for a Milestone single hung series 1000. The metal channels are 29 inches long and are stamped UB28D.The sash weight is 27.2 lbs and I was wondering if i should go for the S380-29 option 2840 or 2850?
Profile picture of Tom
Tom from SWISCO responded:
I would go with 2840. Two balances with this option can support 23 through 28 pounds. The 2850 option will likely be too strong.
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
GUIDE
READ >
Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
GUIDE
READ >
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)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.