The QUANTAPANEL 701-FP Architectural Low-e Storm Window installs on the exterior or interior of an existing window. The product is direct screw mounted to either the sash or frame of the existing prime window using a closed-cell high density polyvinyl foam sealant that is field applied during installation to achieve an optimum seal. The QUANTAPANEL 701-FP can be fabricated in standard rectangular or arched shapes to align with the contour of the existing window. The low-profile 0.688 in width by 0.312 in. deep frame can be installed to achieve seemless integration with the existing window or sash. The QUANTAPANEL 701-FP Architectural Low-e Storm Window is available in standard or custom colors (185 colors to choose from)!