Thought I would share a photo of how I made my firebox effectively deeper. I built my own stove somewhat patterned off the Mark III. I did the same as Harman, laying the front firebrick on their side, but that only lets the coal bed be 4-1/2" deep in the front.
Seemed like I was always fighting a shallow coal bed by the load door, or having coal roll out when I opened the door.
So, since I added a piece of channel iron 5" above the front brick retainer, and layed another layer of firebrick splits on their sides, to give me a full 9" bed, front to back. I had the luxury of having some angle iron baffle supports near the stove ceiling that were exactly 18" apart, so I could get creative with some bolts and angle iron to "reach" down and hold the channel iron in the right spot to retain the bricks.
Works great, except that after this season, my original, lower firebrick retainer at the 4-1/2" level is looking pretty bad. This summer I plan to stand the front firebrick up on end to avoid that. Or I may be building a stoker out of the stove body, so it won't matter. A top load like the TLC2000 would make loading easier too. Maybe I should scrap the firebrick and design some steel/cast bars like the TLC2000?
It's a little harder to load coal with only the upper half of the load door available, but with practice, it works OK.
Here's to a deep bed and a long happy burn.
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- Homemade firebrick front