While fireplaces accentuate the largeness of a room, the rooms do not all come in one size. For smaller rooms, like a child's bedroom, fireplaces were sometimes built in the corner of the room to exploit the space there. In fact, it is now easier to install a new fire place in the corner of a room because the fireplace walls could be tapered exactly just so in order to reflect the heat more efficiently into the room.
You should make sure that you have a power source close by your fireplace in order to plug in any fireplace blowers you decide to run. Usually, you can expect a blower to require one hundred and ten volts of power. You may need to have an electrical outlet installed so you do not end up with an extension cord running across the floor.