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● NFRC Approved ● Miami-Dade Approved
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The hinges, hanging wheels, casters and other moving parts of the broken aluminum doors and windows may be degraded due to the adhesion of dust during long-term movement. One or two drops of lubricating oil per half year can sure its smoothness.
Shanghai DER Building is a professional manufacturer of aluminum fittings. With more than ten years of production experience. We have a group of experienced production team and excellent production equipment, can develop new products according to customer requirements.
