Option Numbers

The difference between the different stamp options for SWISCO balance Series 351 is the weight tolerances.
Please remove the window sash and place it on a scale. The weight of the window sash in pounds is needed to determine the proper stamp option.

Stamp option 2310 will carry a window sash weight range of 5 through and including 9 pounds.

Stamp option 2320 will carry a window sash weight range of 9 through and including 15 pounds.

Stamp option 2330 will carry a window sash weight range of 15 through and including 18 pounds.

Stamp option 2340 will carry a window sash weight range of 18 through and including 22 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.

Thanks for posting. You were right on the first count; for a 15 pound sash, you would need two 2320 stamped balances, or two 2330 stamped balances. I hope this answers your question.