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  1. desheng88

    ISO 15138 standard for flanges

    If i have a circular ducting that is D160mm, I would need to have 4 Dia12 holes. But, what would the position be? 3, 6, 9, 12 o'clock or 45 degrees angle like 1.30, 4.30, 7.30, 10.30 o'clock position? Thanks.

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