I am considering fabricating a hood over the freestanding woodstove and ducting it to another room I am presently preparing a slab for.  Would it be worth trying to blow it through the slab?  I was thinking using 2-3" exhaust pipe tubing or PVC (not as good heat transfer) or some type of duct that could go into the slab.  Or, would it just be about as effective to blow the heat into the room?  We're only talking about a 224 sq. ft. room.  I just hate wasting the heat!  Can't find much info on moving air through the slab as far as materials for doing it.  Any ideas??  Thanks, Rob.

I have a 6 inch pvc pipe feeding two vents for heat in a room with a slab. the PO put it in there. Basiclly, heat forgets it's heat by the time it gets there and it does not warm up the slab that I can tell. John

Take a look at this site for some interesting air heated slab info.

http://www.legalett.ca/Story.htm

I quite like the idea...

Yeah, I had seen the legalett site and it looks like a good idea too.  But, living in S.C. and as small as the rooms I am heating, I'll probably just blow the air into the room and insulate the slab well.  After using the little LOPI stove I was given some years ago and had never used until now, I discovered that it likes to run "wide open" for the best efficiency.  It really is a neat stove.  I had no idea when it was given to me...hope they don't want it back.  Anyway, I am surrounding it on three sides with some, of all things, old lab tabletops.  Very heavy and seems to even the heat output well.  Just fire it up good for about an hour and my main room and a loft is very comfortable on the coldest days around here.  Now, I just need to fabricate a hood over it and shoot it down to the room to be on a slab, below it.  That way I won't have to start opening doors and windows!  I hope that's the way it will work anyway.  Thanks for your replys. 

One of the problems with heating a slab with air is the difference in mass between air and concrete.  It's the old "raise one lb. one degree" issue.  How much is a lb. of air?  It's a bunch.  Meaning that even if your air is 100 degrees you still have to move a lot of it for a long time to heat up several tons of concrete.  Or else your air has to be 150 degrees.  Probably more effective to just pump the warm air into the room.  Now if you had some sort of a water jacket on the stove with 85 degree water and pipes in the slab you could move gallons of water instead of cubic acres of air. 

Mark