block and tackle balance
A quick learner from winter haven florida says:
August 12, 2014
all i have is window size single pane glass single hung windows what size do i need.
Tom from SWISCO responded:
August 13, 2014
I'm afraid there's no way for us to know what Series balance you have based on just that information. Is there an identical window elsewhere in the house that may have the same balances? If so, that's probably your best bet.