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並前往https://www.moreland.vic.gov.au/globalassets/areas/esd/factsheet-double-glazing.pdf

DOUBLE GLAZING - Moreland City Council

A typical single glazed window has a. U value of 5 or 6. Double glazed windows will have U values in a range between about 3.5 and 1.5. The lower the U value ...

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