sash support

Quick Learner from FL
I have tilting windows. The sash support is 29 inches long and has a number stamped r C 2840 on the back. I assume I need a 770. When I tried to order I was told that I need to select Option 29A, 29B, etc. I could not find an explanation of the different options. What option do I need?
5 Replies
Tom
Tom from SWISCO
SWISCO
Expert
Thanks for posting! As stated on the S770-29's product page, the stamp option represents the strength of the channel balance. More often than not, you can locate the stamp on your channel balance. However, in your case, that does not seem to be the case.

Your best bet at this point is to weigh your window sash and compare its weight to each option for the S770-29. The weight range for each option are as follows:

-29A: 7 through 12 pounds
-29B: 12 through 18 pounds
-29C: 18 through 23 pounds
-29D: 23 through 28 pounds
-29E: 28 through 32 pounds

Please keep in mind that the weight range information is based on 2 balances per sash. Balances are designed assuming frictioan in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
Quick Learner
Thanks for the reply. My window weighs 25 pounds and I have two balances per window. Do I need the S770-29B or the S770-29D? I assume it is the S770-29B.

Thank You
Tom
Tom from SWISCO
SWISCO
Expert
Thank you! Actually, you'd want the 29D. Since your sash is 25 pounds, it fits within that weight range. Remember, these ranges are already taking into account that there are two balances per sash.
Quick Learner
Thanks,

I placed my order
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