If you have a newer EPA-rated woodstove, you might have a catalytic combuster in there somewhere. Make sure to check the owner's manual about cleaning it - and stick to the schedule. Combusters should last 5 or 6 years, but a clogged or dirty one will fail rather quickly.
Although there are a variety of measuring units, firewood is normally sold by the cord, or a fraction of a cord. The dimensions of a “standard cord” is a stack of wood piled 8 feet long, 4 feet wide and 4 feet high. You won’t get a full 128 cubic feet of firewood with a standard cord because of the airspace between the pieces of the wood; the amount of wood in such a stack will depend upon the size and straightness of the pieces, how they are split and how the wood is stacked. Because of this, the total cubic feet in a cord can vary from 70 to 90 or more cubic feet.