2 flues - same height?

[Nicholas]

I will have 2 8" class A flues in a chimney chase, 1 for the main level Masonry Heater, and 1 for the basement. I plan on the pipe sticking about 2' out of the chase cover. Should the flue heights be staggered? or is it ok to have them the same height? and issues with the un fired flue pulling smoke back down ?

Thanks,
Nick

 

[Todd]

The main floor flue should be a little higher than the basement flue. Most basement flues tend to be a source for make up air when not in use.

 

[begreen]

Agreed, make it 6"-12" higher to avoid reverse flow of smoke into the other flue.

 

[Don2222]

Hello

I like about a foot apart.
We put in a Stainless Steel for our new Buderus Boiler and used the old clay lined block chimney for the basement wood pellet stove.
Works great. See pic

 

[Ashful]

Interesting... most old houses have large chimney stacks, containing multiple flues for multiple floors, and all are built to the same height. The house I grew up in had a huge stack with three flues, two for basement (boiler & fireplace), and one for the first floor (another fireplace). All topped with an enormous slab of flag stone. Never any problems with the unused flue(s) drawing make-up air.

 

[begreen]

Consider yourself lucky. There are frequent complaints of smoke being drawn in from the adjacent chimney and seeping out of that inactive fireplace. Craig even developed a product to remedy this problem.

http://www.extendacap.com/