DuraLiner double walled inside 8 x 8 clay liner

Has anyone has success getting the DuraLiner double wall insulated 6 inch pipe down a 8 x 8 clay liner? Is it a common practice or just to tight? The literature indicates it needs 7 inches which a 8 x 8 clay liner would have but the mortar joints may make it less in some spots Im sure.

I have a 8 x 8 clay liner that is in good shape but the chimney does not have zero clearance to combustibles.

Edit: ID dimensions are 7 1/16 x 7 1/16

double-d said:

A lot of the 8" x 8" clay flue liners in my area are actually 6.75" x 6.75" on the interior. Plus if there is any mortar slag hanging out or if the flue tiles are not stacked straight broken, then you will have a tough time getting it down. Like what was mention, a pulling cone is worth it if you have a tight area to get the liner through. Also is this a straight shot or is there a off set in the flue?

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Its a straight shot and the tiles are about 7 1/16 x 7 1/16 inside although I can tell the one joint I can easily see and measure is offset by 3/16 of a inch which would make it very tight if not too tight as some other tiles could be offset in the other direction. If the pieces were not so expensive for the 22 ft I need I would just buy it and hope it fits.

mellow said:

My 8.5 OD was 6.75 ID and surprisingly I was able to fit a 6" insulated flex liner down it, with the help of a pulling cone, so I doubt you can fit that down your 8 x 8.

I would look at running a 5.5" insulated liner, at 22 ft you might have enough draft to compensate for the smaller pipe.

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My ID is about 7 1/16 x 7 1/16 so it sounds like it larger then what you were working with. Am I missing something? I called it 8 x 8 I haven't actually measured it I suspect its 8+ I just got the inner dimensions from stuffing a tape measure in the wall at the hookup. Not going on the roof again