Reply: no code, but we recommend 6″ or more vertical separation distance between adjacent flues. Horizontal flue spacing: Even in a multi flue masonry chimney you don’t run two flues through the same physical opening. Adjacent flues require horizontal separation.

Can you have two fireplace chimneys?

Multi-Level Fireplaces Fireplaces on multiple levels can also share one chimney structure. … Each fireplace can face the same direction, if you want, since they will not block each other. You might even choose to combine a multi-level fireplace with a double sided fireplace, combining three fireplaces into one chimney.

Why do I have 2 chimneys?

A flue is a venting system, each system needs its own so If you heat your home with oil or gas and have a fireplace you would have two flues. Often times they are in one chimney so if you were to look down the chimney it would be separated into two venting system inside one chimney.