Heating unit

Claim 1

A fireplace heater unit comprising a box having a bottom, spaced upright side walls, a back wall interconnecting the side walls, a front wall interconnecting the side walls and having a door and air inlet openings therethrough, and a top interconnecting said side, back and front walls and having a chimney opening therethrough, whereby the interior of said box will serve as a combustion chamber; a back outer wall forming a back chamber with the back wall of the box; an air inlet duct connected from atmosphere into the back chamber; means for forcing pressurized air through the air inlet duct and into the back chamber; conduit means extending from the back chamber over the chimney opening through the top; an outer top wall spaced from the top and forming a front chamber with the top, said conduit means extending into said front chamber; means sealing said front chamber from the chimney opening; at least one outer side wall forming a side chamber with a side wall of the box, said side chamber being connected to the front chamber and separated from the back chamber; an outer bottom wall forming a bottom air chamber with the bottom and the front wall of the box, said bottom air chamber being open to each said side chamber and separated from the back chamber, and having openings from the bottom chamber through the front wall whereby heated air in the bottom chamber is forced through said openings; said means, for forcing pressurized air including a blower for directing atmospheric air against the back wall of the box, then over the top of the box, then along at least one side wall of the box, then beneath the box and out from beneath the front wall of the box; and door means connected to the front wall and adapted to close the door opening therein.