sash box replacement

Question

Hi

Lower sash measures 39 1/2 x 39 1/2

Which replacement sash box do I need?

Bob

Paul · Accepted Answer

Hi, Bob. We normally go by the visible glass size, not the sash size. For the sash size, we can't be absolutely sure, but we can guess. See if your visible glass is 36-7/16" wide by 33-15/16" high. If so, you will need the 24-13L and 24-13R Andersen balance boxes.