National standard steel doors : The CNS ,Chinese National Standard , 7184 Grade A
type steel door is certified fireproof performance of
1 hour and compressive strength of 280Kgf/㎡ seal
and water tightness of 35Kg‧f/㎡
Certificate of CNS MARK, Chinese National Standard,
issued by Bureau of Standard , Metrology and
Inspection of Ministry of Economic Affairs, Taiwan .
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