Now hollow double tempered glass and low-E glass generally have good sound insulation effect, which can reduce noise by more than 60% for aluminum window sash.
Heat insulation performance, observe the aluminum heat insulation strip, fire the heat insulation strip with a lighter or blower to know, good heat insulation performance, temperature up to 210 degrees C will not have much change.
Profile corner connection, corner connection can not have a gap, should be a small not obvious line, and no defects, not thorn hand, relatively smooth.
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