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  • Relining a flue and having masonry work done is really expensive, so this is another option. I just had a (masonry) chimney contractor tell one of my clients that these suck, but they seem to work ok. I was in a house recently that had a woodstove with one of these chimneys.

  • I would guess they are installed in pairs for multiple floors. I think the upper one is taller because of the sky light.

  • They will never be the same in height so that each one receives equal air flow so it will not be disrupted by the other and the reason for two is that the air flow is correct becouse of the fact the whole space of the chimney is used imagine two lungs and only one nostril to breathe with

  • the height of each can never be the same because of the flow of the air and disruptions by one another and there are more than one because of the flow of the air can be correct and the reason for that is because of the spacing of the chimney if you were a person and you had more than one lung let’s say two lungs and had less than two nostrils let’s say one nostril then you can imagine

  • I think your question is why the ones in the top photo are much higher than the ones in the bottom, rather than why in each pair on is lower.

    I believe it is in relation to the apex of the roof, that is you want the chimney’s higher than the highest point of the roof so that in all wind conditions the smoke is taken above the roofline rather than slammed back against the roof itself. Hence, in the top photo, the roof has a steeper pitch so the chimney’s must be taller to reach above the highest point of the roor.

    • What is the problem with smoke being “slammed back against the roof itself?” I’d think that most shingles would be, um, smoke resistant. Having suffered from smoke going up one flue and down the other, I can see the sense in having each flue rise to a different height. Wouldn’t that make this type setup superior to an actual chimney? (Although I guess you could always extend one flue beyond/above the chimney.)

      • You want to smoke to dissipate as quickly as possible away from the home. By having your chimney lower, it can gather against whatever is blocking it, ie the roof line, as wind does this can drive the smoke down along the house into windows etc. All in all you just want the smoke to get higher than the highest point of the house and out of town..

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