(See for more information on the Energy Star windows program. Northern zone will likely require the addition of LoĒ-i89 on the 4th surface to comply with U-Factor requirements. Windows with LoĒ³-366 that are rated and certified by the NFRC can comply with Energy Star ™ requirements in all regions of the country.
The smaller the number, the better the window system is at reducing heat loss.Ĭardinal actively supports and participates in the National Fenestration Rating Council (NFRC).
☏, using winter night weather conditions of 0☏ outside and 70☏ inside. This represents the heat flow rate through a window expressed in BTU/hr On board, private Viewliner roomettes and bedrooms are available at an extra cost, flexible dining. It has some of the best scenery in the eastern United States, with views of farmland, rolling hills, valleys, rivers and mountains. The lower the number, the better the glass is for reducing fading potential of carpets and interior furnishings. The Cardinal Amtrak route travels between New York and Chicago (through DC) three times each week. This region includes all of the ultraviolet energy and part of the visible spectrum, and will give the best representation of relative fading rates. The portion of energy transmitted in a spectral region from 300 to 600 nanometers. 
The lower the number, the better the glazing is at preventing solar gain. The amount of solar radiation that enters a building as heat. (See and for more information on glass optical data and the Window 7.4 program.) Emittance of ordinary (pyrolitic) low-E is 0.16.
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