Moderator Post: >Wood StovebyHandyman on 12/27/2004
There are hundreds of different firebrick on the market for more applications than you can imagine.
Any wood heater should use nothing but "hard" firebrick. It can be purchased as full brick-9x
4 1/2 x3, used fireplaces & chimney liners, or as half brick-9x4 1/2x1 1/4, used as liners for stoves & heaters.
An experienced mason using a good wet abrasive saw should be able to cut & fit half brick for any requirement. I suggest you find an old timer mason who "knows his stuff".