Window energy management system with enhanced force protection

Abstract

A blast-resistant retrofit window insulation system has panes of low-e coated polymer film, such as TPU or ETFE, held in a rigid frame to form a pane assembly. One or more pane assemblies are stacked to make a multilayer unit, or are mounted in a robust polymer casing, that is sized to fit the window frames of an existing building window or to attach to the wall of the building surrounding the window. The polymer film(s) can absorb energy of a blast without breaking provided that the collective thickness of the film(s) is at least 20 mil, and preferably 24 mil or more. The polymer film pane assemblies, when securely bolted to the structural components of the building around the window, have a remarkable ability to absorb blast energy and mitigate secondary debris hazards.

Dependencies are inferred from the claim text.