Sorry, late to the party on this one. You could get an 8" chimney bottom plate, trim it to the height you need and anchor it to the top of the flue gallery. Then connect that to your transition collar with an 8" male-male union.
If you're firm on not wanting to drill into the flue gallery, you could have another go at smoothing out the enlarged hole and use a 9"-8" flue reducer and the union. But, those reducers are pricey.
If you're firm on not wanting to drill into the flue gallery, you could have another go at smoothing out the enlarged hole and use a 9"-8" flue reducer and the union. But, those reducers are pricey.





Comment