Window channel balance

A handy person from USA says:
Window channel balance is from a double hung window 28" in
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Paul from SWISCO responded:

Thank you for posting. Start off with taking a look at our S770-28 channel balance. Does look like your balance? If so, then you will need the stamping on your balance to pick the option you need. If there is not a stamp on your balance, then you will need to weigh your sash on a scale, and refer to the sash weight chart located on the product to decide on the most appropriate option. 

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