Casey from SWISCO responded:
July 18, 2011
Hi Craig,
This is SWISCO Series 390. I believe the 29 6 translates to our 2960 stamp option. To check, please remove the window sash and place it on a scale. A 30" Series 390 balance with stamp option 2960 will carry a window sash weight range of 32 through and including 35 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. If your sash does fall into that weight range you can choose stamp option 2960; we just added this option online for you so please allow 2 to 3 weeks for production. |
Casey from SWISCO responded:
July 18, 2011
Hey Craig,
Unless you think your scale is not correct, go with the 2950 stamp option. The 30" Series 390 with stamp option 2950 will carry a window sash weight range of 28 through and including 32 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. |