Casey from SWISCO responded:
September 3, 2009
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. |