Wood sash measurements, height and width

A contractor from vt says:
July 13, 2011
I identified the parts needed as # 390. The old hardware is missing, so I don't have any reference #'s to go by.

The saches are all solid wood. Below are the glass(pane) measurements
Hight Width Qty.
30 30 4
20 30 4
30 20 4
30 24 2
24 36 2

Can you please advice me on what sizes to purchase.
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Paul from SWISCO responded:
July 18, 2011
For wood sashes, many companies have used the Swisco Series 500 Spiral Balance with the 17-007 Bracket.

Approximate sizes for sash:
  • 30 30 : 31 33
  • 20 30 : 31 33
  • 30 20 : 21 23
  • 30 24 : 25 27
  • 24 36 : 37 39
Please note these sizes are approximate.
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