Description for the different channel balance options

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Casey from SWISCO responded:
The option can be found on the original balance, if you cannot find the numbers on the balance remove the window sash and place it on a scale. The weight of the window sash in pounds is needed to determine the appropriate stamp option.

2610 will carry a window sash weight range of 5 through 9 pounds

2620 will carry a window sash weight range of 9 through 13 pounds

2630 will carry a window sash weight range of 13 through 19 pounds

2640 will carry a window sash weight range of 19 through 26 pounds

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
A home owner from TX says:
I needed to order a 27" Series 390 Channel Balance, but the system will not allow me to order till I choose an option. Where can I find a description of these Options: 2610, 2620, 2630, 2640
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