Pella new construction windows
If I remember correctly the nailing fin is rolled back for shipping and the window can either be installed with the fin remaining in the rolled back position or pulled out to be perpendicular to the frame.
In your case leave the nailing fin in it shipping position and install that way. Ensure you follow the installation instruction to a "T" as far as openning preparation and not setting the bottom of the window directly on the opening ledge.
When its all said and done there is usually more said than done
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