Andersen window balancer

A quick learner from Topsham, ME says:
Do these balancer come in different sizes?
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Bob from SWISCO responded:

Andersen balances are calibrated to work with certain windows. This is determined by the stamp codes on the metal box. One clump of numbers on the metal box will tell us the replacement you need. You can find out more about Andersen balances in this blog article here .

How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
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