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The ideal vertical kit comes with a lead flashing / collar for the roof penetration
 
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Can someone explain to me how this cutting measurement works? So I have a flue that is too long, where do I take the measurements from to cut? Sorry if I am being dumb. I just can't make sense of it
 
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Can someone explain to me how this cutting measurement works? So I have a flue that is too long, where do I take the measurements from to cut? Sorry if I am being dumb. I just can't make sense of it

Ah ha, I think I have got it now. This means if I want to slot a piece in to the middle where the X is marked. Am I correct
 

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