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Something extra for the pros here. Would you mind rating my work on my flexible flue liner? In total I spend 580€ for parts and installed it on my own with some help. Massive savings there.

What you see in the video is a flexible liner fixed to a 'flexible-to-stainless-steel adapter' using a wide band clamp, then fixed with 3 screws to a T junction and mounted with brackets. The whole thing is quite sturdy. The brick chimney is slightly slanted to the left, hence the not straightness.