These stock firescreens (Pfaff 4-Door, 2-Door, Gashette 2
& 4 Door, Matthews 2 & 4 Door, and Customized 2 & 4 Door) fit into your
fireplace opening approximately 2½". Therefore, you have no gaps -- your
fireplace is overlapped with the flange. This allows the firescreen to be built
smaller than the opening for the piece that slides into the fireplace for the sake of
allowing for expansion and fitting property if your fireplace opening is not perfectly
square (they rarely are).