Hello to all. I am living in my grandpas old house and using his old wood stove for primary soure of heat from now on. I have a question , do all or some stoves not have firebrick? Mine does not, although it has shelves shelves halfway up both sides, though badly bent. Since I am new to burning wood constantly I need my stove to be in top producing shape. Should/could I add firebrick to be more benificial? And does anyone know what kind of stove this is? Looks like a big bear knock off perhaps. Thank you to those who help.