Option #1 – Overlap. This frame has a 1 1/2″ wide mounting flange, which is commonly installed on the face of existing brick molds.
Option #2 – Blind stop. (AKA -Inset) This frame has a 5/8″ mounting flange, which is commonly installed inside the brick mold.
Both options still have the same internal operating or fixed sash/screen inserts.
Combination of these 2 frames can be ordered, such as where a drop sill is present a ‘Blind stop 3’ can be ordered, which is a storm window made with Blind stop top and side rails and an Overlap bottom.
1″ Sill expanders are available as well.