SWISCO - The Replacement Hardware Authority

Caldwell JN 36-4 Cannel balance

A quick learner from Charlotte, NC says:
Block and tackle 36-4 Caldwell JN 36-4 channel balance. Sash weight estimate is 15-20# single hung no tilt window.
User submitted image of their window hardware.
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Paul from SWISCO responded:
Please see our S380-37 channel balance, I think this may be what you need. I would also recommend the 3640 option, but you may want to get the exact weight of your sash just to be sure.
A quick learner from Charlotte, NC says:
Followup. The guy that worked on my window last time said that I need c or d balance and that should be good for the sash in question. I do not have a scale to weigh the sash. Any thoughts. do you know what he means by c or d? I see that the second option you mentioned should be good for 20# sash.
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Paul from SWISCO responded:
Some older balance manufacturers used letters to help denote the strength of the spring. We happen to use numbers, instead. Some letters and numbers can be cross-referenced, but I'm not exactly sure what your installer means. Simply "C" or "D" isn't enough.

Your old stamp, 36-4, usually corresponds to our 3640 option. This could be matched to an older "36D" option, which may be what your installer means. The 3640 can carry a sash weight of 23 through 30 pounds.
A quick learner from Charlotte, NC says:
Thanks for your help and patience on this. I'm sure you are correct about the c and d. I will be ordering soon but will be waiting after home inspection on Saturday to see if we will need more than one set. Thanks again.
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