A quick learner from Crofton, MD says:
December 15, 2015
Are you able to identify an Andersen balance from the measurements of this window? 31 3/4" x 45 1/2"
Paul from SWISCO responded:
December 17, 2015
Based on those dimensions, you may need our 24-737. However, this isn't the most reliable method. We always recommend confirming based on your balance stamps to be 100% sure.