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Most but not all factory chimney listed for solid fuel requires a 2" clearance to combustibles that is a air space. Packing insulation in there is a common cause of unfriendly fires. Note the homemade attic insulation shield. Usually a firestop/ radiation shield with attic insulation shield over that. Probably improper roof penetration, too. More pics? Brand chimney? Where chimney can come in contact with people and vice versa, it should be enclosed with ordinary framing and sheathing while maintaining clearances. This is called "vertical fireblocking" when it forms an 'effective barrier' from attic deck to underside of the roof deck. Recommend Level II inspection.

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