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Wholesale of ventilation ducts
Guizhou duct manufacturer's duct standard 1.1.1 Scope of application This construction process standard is applicable to the processing and production
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Guizhou duct manufacturer
Duct standards
1.1.1 Scope of Application
This construction process standard is applicable to the processing and production of metal, non-metal air ducts, composite material air ducts or ducts used in ventilation and air conditioning engineering of building projects.
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