I have two flues in my home. A 8" basement flue 60" off of the cement floor thru cinder block. Very easy to work with any unit. The second is a 6" flue in the one side on my living area set up to burn a small stove either wood of coal. There is a 2x6 framed decked area for stove placement with the synthetic material used around stoves.
But the flue for this area is a mere 25" off of the deck. This limits which stoves I can use. I believe the po's built this area to seat a Harman Mark I although they had a Mark III in place when I purchased. I picked up a Godin Oval in excellent condition but the outlet of the Godin is almost 32". I need to pipe into 24". No room for elbows. I put myself in a jam buying this stove. But it looks great.
How many inches floor to flue is typical in a living room setting?