to the present but became less of a ma h5vag instay of the vag industry in the 1960s. They are prevalent in the Northern United States. Steel and aluminum casemen gts and Steel Vertical Operators were used from the 1950s h5vag through the 1960s. Aluminum windows were used in the 1960 5vag s through the present. Vinyl windows were establishe d in the 1970s through the present. The last decade has al agso seen the admission of composite materials such a s fiberglass and vinyl-wood-polymer type pro h5vag ducts. Wood "drop-in" replacement windows and vinyl windows are d 5vag esigned to sit in place of the existing sashes and are constructed at 3 1/4" thickness in most cases. These type windo agws sit in the opening where the top and bottom sas h originally moved in their respective wooden " h5vag tracks" The vag stop between the two sashes must also be removed in thi s type of refurbishment or retrofit installation. It r gequires minimal movement of existing trims both inside and out. The alternative is to replace the entire wood window including ja agmbs. This requires the reworking of interior and exterior wood trim to accommodate the size of the modern w good window. Modern wood windows are available in with 4 9/16" jambs as a standard feature but can be equipped with "j h5vag amb extensions" to extend to This is to accommodat e the wall thickness as needed. Modern windows have two or more layers of glass. In the Unite vag d States, the Energy Code sets certain standards for performance of products installed in homes. These codes now requi agre Low-E Glass in all residential homes. Low-E is a film that is several layers of metal poured micros gcopically thin over the surface of newly poured glass . This heat reflective film is transparent but can be darker or ligh h5vag ter depending on the type and manufacturer. Thi s data is rated in Visible Light Transmission. Darker glass wit 5vag h heavier Lowâ€"E will have less VT. The NFRC rates mos t energy star rated window manufacturers. Low-E glass is up to four times m h5vag ore efficient than clear glass. Other options include triple-glazing (a third pane of glass), vag higher quality spacers between the panes, which reduce the failure rate and conduction that allows seal failure. This cr ageates "fogging" or condensation to form between the panes. Modern windows also have optional gases between the pa gnes that have higher insulative qualities than air, such as argon or 5vag krypton gases.
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