Question re. number of Constant Force Balances in a Double Hung bottom Tilt window

A home owner from Turks and Caicos Islands says:
Hi There
Would you know how many balances a Constant Force Balance double hung bottom tilt window actually has? Does it have 4 one for top and bottom of each side?

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Tom from SWISCO responded:
I can't say for sure. Different windows use a different number of coil balance springs. Knowing that it's a double hung window doesn't tell me how many springs are used on each side. Do you have an identical window elsewhere in the house that you can use as a reference?
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