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| New Labeling System of Grading for Windows to be Noticed |
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METI announced the amendment of “the Labeling System of Grading on Thermal Insulation Performance for Windows” on May 24, 2010. Under the current business practices, the openings are divided into 3 types; windows, glass and sashes. However, in the Amendment, they will be indicated just as “windows,” and below is a new labeling.
The System is going to become effect on April 1, 2011.
| Coefficient of Overall Heat TransmissioniW/m2₯Kj |
Indication of Grading |
| 2.33 or lower |
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| 2.33 ` 3.49 |
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| 3.49 ` 4.65 |
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| 4.65 or higher |
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Coefficient of Overall Heat Transmission:
In case of that the indoor-outdoor temperature differential is 1℃, it is the value of the heat quantity of convection per 1m2, indicated in Watt. A smaller value means a better thermal insulation performance. |