angle and length of pipe

I hope someone can help us with some info on the angle and length of a chimney for a wood stove. We have a double storey house and want to install a wood stove on the bottom floor but the only place to put it is not against an outside wall so the problem is that the chimney will have to run along the concrete ceiling before going outside. The length of this is about 6 meters at about a 15% angle then outside and straight up.
Could that work?

If you have a lot of "up" after the horizontal section it would probably be OK, this is where your draft is created. Might give you some troubles on cold starts unless you burn something fast and hot to get the draft moving.

Thanks a lot Roy and yes, the outside piece of pipe will be quite long because its from the bottom floor to the roof of the second floor..