Paul from SWISCO responded:
August 25, 2017
The 70-191 is traditionally used on the 200 Series tilt-in Andersen window. From your rough screen frame size, 26.5" x 53" , you might have a 200 Series 2449 window with a screen size of 25-3/32" x 54-3/8" high. You may want to contact a local Andersen dealer just to be 100% sure.
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