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ISO 7807:1983
M00000060
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ISO 7807:1983 Air distribution -- Straight circular sheet metal ducts with a lock type spiral seam and straight rectangular sheet metal ducts -- Dimensions
standard by International Organization for Standardization, 07/01/1983
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Specifies dimensional characteristics of straight elements of circular and rectangular ducts. Applies to air ducts used in heating, ventilating and air conditioning. Tabulates recommended (R 10 series) and additional sizes for circular ducts (tables 1 and 2) as well as recommended sizes for rectangular ducts (table 3).