Although metal casement windows are not the most common type of windows you will encounter in today's structures, you will find them in a number of occupancies-large multiple dwellings, project-style occupancies, single-family dwellings, and factories and commercial occupancies. Because of their poor insulating value and single-pane glass construction, most of these windows have been removed and replaced with newer windows. However, the structures that still have these windows can present problems for occupants seeking a means of egress and for firefighters attempting to gain entry or escape through these windows.
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