Outside LoE 3
LoE-366 glass features a triple silver coating sputtered onto the exterior lite of an insulating glass (IG) unit, thus reflecting heat back into the atmosphere and lowering U-Factors
Room Side LoE
LoE-i89 glass features an Indium Tin Oxide coating sputtered onto the indoor lite of an insulating glass (IG) unit, thus reflecting escaping heat back into the room and lowering U-Factors
When the temperature soars, ordinary glass just can’t handle the heat. And tinted glass spoils the view. To solve this issue Eurotek has partnered with Cardinal Glass to use LoE3-366, which has been specially formulated to reject the sun’s heat without affecting the view. It lets more light in and keeps more heat out. So your home stays cool and comfortable. With the formulation of Argon gas in between double and even Triple pane glass combinations Eurotek offers the ultimate efficiency in thermal control and cost savings for your home.
Eurotek windows has been tested by independent labrotories and exceeded all EnergyStar criteria for all climate zones across North America.
What’s more, LoE3-366 provides exceptional fading protection as well. It blocks 95% of the sun’s damaging ultraviolet rays (a leading cause of fading), so it will help your furniture, carpets, curtains and wood ooring stay beautiful for years to come.
Energy Performance Testing, Certification, and Labeling
The National Fenestration Rating Council (NFRC) operates a voluntary program that tests, certifies, and labels windows, doors, and skylights based on their energy performance ratings. The NFRC label provides a reliable and standardized way to determine a window’s energy properties and to compare products.
The NFRC label can be found on all ENERGY STAR® qualified window, door, and skylight products, but ENERGY STAR bases its qualification only on U-factor and solar heat gain coefficient ratings, which are described on the next page.
Heat Gain and Loss
Windows, doors, skylights can gain and lose heat through:
- Direct conduction through the glass or glazing, frame, and/or door
- The radiation of heat into a house (typically from the sun) and out of a house from room temperature objects, such as people, furniture, and interior walls
- Air leakage through and around them.
These properties can be measured and rated according to the following energy performance characteristics:
U-factor is an indicator for how insulating your overall window is. The lower the U-Factor number, the more energy-ef cient the window/door is. Especially important in colder climates.
Solar heat gain coef cient (SHGC) is the is the amount of heat the window absorbs, and transmits to the inside of your house. The lower the SHGC, the less solar heat it transmits and the greater its shading ability. A product with a high SHGC rating is more effective at collecting solar heat during the winter. A product with a low SHGC rating is more effective at reducing cooling loads during the summer by blocking heat gain from the sun. Your home’s climate, orientation, and external shading will determine the optimal SHGC for a particular window or door.
Air leakage is is how much air is leaking into your house through the window when there is a pressure difference. Typically, drafty homes have high air leakage windows and doors. A product with a low air leakage rating is tighter sealing than one with a high air leakage rating.
The ability of glazing in a window, door to transmit sunlight into a home can be measured and rated according to the following energy performance characteristics:
Visible transmittance (VT) is how much visible light is going into your house through your window and door. A product with a higher VT transmits more visible light. VT is expressed as a number between 0 and 1. The VT you need for a window and door should be determined by your home’s daylighting requirements and/or whether you need to reduce interior glare in a space.
When insulating glass units are installed at altitudes of approximately 5,000 feet above the manufacturing altitude, the conventional approach has been to install a capillary tube. The tube permits the insulating glass unit to pressure equalize with the local atmosphere and relieve the altitude pressure differential across the unit created by the difference in manufacturing altitude and installation altitude. When argon gas is used in the airspace, capillary tubes will permit the argon gas to escape, and U-Factors should be based on an air- filled IG unit construction.