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Summary
From the viewpoint of promoting measures to counter global warming, an
urgent issue is how to foster energy conservation in the household sector,
which accounts for approximately half of the Japan’s civil sector, where
demand for energy continues to grow. An effective measure to facilitate energy
conservation in the household sector is to create a market environment that
allows consumers to think about the role of windows in their houses, which
constitute a major factor in determining the energy conservation performance
of houses, and to choose windows with a higher thermal insulation performance.
For this reason, METI has decided to formulate and announce the Guidelines for
Information Provision on Thermal Insulation Performance of Windows pursuant to
Article 86 of the Law concerning the Rational Use of Energy (Energy
Conservation Law). The Guidelines, which are to be used by manufacturers of
windows and related products as a reference in providing product information
for consumers, aim to foster the widespread use of higher-performance
insulating windows by making information on the thermal insulation performance
of windows available to consumers.
As a reference for companies concerned, the Guidelines show how information
on the thermal insulation performance of windows should be provided.
Outline of the Guidelines
• The Guidelines are applicable to particular types of openings of houses,
namely, windows that directly influence the heat flowing into and out of
rooms. In light of the current business practices, openings are divided into
three types: windows, glass and sashes.
• The assumed entities that provide information for consumers through labels
indicating the thermal insulation performance of windows and related
products are companies engaged in the manufacture, processing and import of
windows, glass and sashes.
• Windows, glass and sashes should be classified respectively into four
thermal insulation levels, which are to be indicated by the number of stars
on the labels.
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