The QUANTAPANEL 605-FG Architectural Low-e Storm Window installs on the interior of an existing operable window. Installation of the QUANTAPANEL 600 Series is through pre-drilled holes via screws that attach to the window jamb perpendicular to the plane of the window. A compressible seal on the perimeter of the frame ensures a tight seal and allows for slight out-of-square conditions in the window opening. This Fixed Glass/Fixed Screen low-e storm window has a sash that is removable to the interior, and is retained in place by spring-enabled slide bolts. This product can be configured with a screen, thus allowing for fresh air ventilation when the interior sash is removed. This product is often specified for casement windows, or for screened/semi-enclosed porches where the installation of the glazing is desirable during cooler seasons. The patented QUANTAPANEL 600 Series provides for substantially reduced air infiltration, which is necessary for optimum performance of an interior secondary sash system. The QUANTAPANEL 602-PW Architectural Low-e Storm Window are available in standard or custom colors (185 colors to choose from)!