Spiral balance length help

A home owner from Arcadia says:
June 17, 2016
I need spiral window balances for a vinyl window. I need blue tip 5/8" but am not sure what length to get.I have misplaced the original balances.

My total double hung window measures 28 X 46 1/2 inch.

The visible glass in the sash is 21 3/4" x 25" .

Could you please advise me on what length balance I need. It is for the upper half of the double hung window.
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Paul from SWISCO responded:
June 21, 2016
Thanks for posting. Our associate tells us you called and mentioned that the visible glass is actually 19". Based on that, we recommend a 21" long spiral balance. In your case, an S600-21.
A handy person says:
June 21, 2016
The visible glass is 21 3/4". I had a 20 in spiral balance and it was too long. Thank you.
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Paul from SWISCO responded:
June 23, 2016
Sorry for the confusion. If your 20" balance is too long, then consider the 19" long balance istead.
19" Series 600 Spiral Tilt Window Balance
19" Series 600 Spiral Tilt Window Balance
S600-19
$8.32
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