Tom from SWISCO responded:
December 3, 2020
This style of awning window operator is almost always made to the same standard size, with the only variance being the size of the arms. Between the three sizes we carry (39-069, 39-037, and 39-070), the best way to choose which one to go with is to measure the "elbow-to-elbow" distance, as shown on each operator's respective store page. |