The support of flange which is attached with the duct will b

The support of flange which is attached with the duct will be paited.分析
The support of flange which is attached with the duct will be paited.请帮忙分析此句是都正确.WHICH 用来修饰什么?SUPPORT 还是FLANGE.此句是否等同the support of flange attached with the duct will be painted.
非常感谢您的回答。那有没有一种用法是:后面的定语不是修饰THE SUPPORT OF FLANGE 这个整体，我就想用来修饰FLANGE.例如：喷涂和管段相连的法兰上的支撑物 the support of ( flange which is attached with the duct) will be painted.是否正确？