Add an extension jamb to extend the window frame so that it will be flush with the top surface of the insulation panel.
To fasten the interior half of the jamb we used standard wood deck fasteners from ITW Buildex.
The window jambs are installed move onto the next step add a wall duct stack fitting to extend the forced air duct beyond the InSoFast.
Wall Stack Register Stack Head. For installing a wall register use with wall stack duct and fittings into a 2″x4″. Link
Wall Stack Vertical 90 Elbow. Used for connecting to wall stack duct and fittings. Link
Install an electrical box extension ring, commonly called an “add-a-depth-ring”. Not to be confused with the Star Wars death star. Link