Tom from SWISCO responded:
June 20, 2017
If your sash weight is exactly 28 pounds, I suppose you could use either option, but you may want to see if it leans one way or the other. Typically, we like to stick with what was used originally, especially if you found it worked fine while you had it. In your case, it would be the 3240 option.
If your shoe is more than 1", but less than 1-3/32", I would go with the Series 385 instead. It's likely it was once 1-3/32", but wore down a little over time. |
Tom from SWISCO responded:
June 21, 2017
Ah, if the sash is 27.6 pounds then I would definitely go with the 3240. You mention that some windows are harder to pull down; this happens when a balance is too strong. A 3250 option would actually make it worse. You may want to weigh those sashes to be sure that 3240 is the right option. You don't want to just go to 3230 without checking, since you don't want to risk getting balances that are too weak. These things are like Goldilocks' porridge: they need to be just right.
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