
Air distribution - Straight circular sheet metal ducts with a lock type spiral seam and straight rectangular sheet metal ducts - Dimensions
出版:International Organization for Standardization

專家解讀視頻
JIS A 4009:1997 - Equivalent
SS 2609:1987 - Similar
KS I ISO 7807:2008 - Identical
KS I ISO 7807:2013 - Identical