spring series 160 coil

A contractor from phila says:
my existing plastice support (part # 15-150D ) holds two springs on each side of the window, the window weights 14 lbs. my question is what weight spring do i install and do i install (2) on each side and connect them together
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Paul from SWISCO responded:
You would use two of the S160-7 on each side.
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