Firebox size

[MattJ]

I am refurbishing a unit for a coworker and had to make a change to the size of the back of the raised cabinet. I straightened the back and top is wider than original calculations. Now my firebox of 115% is 99.5% based on actual measurements.

I see everyone usually recommends a firebox slightly oversized. Will there be issues if it is left at 99.5% of recommended?

By the way firefox is insulated. I haven't built firebox door yet.

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[AndrewPalmer71]

I had the same issue when I decided to add cabinet doors to my smoker. Prior to the cabinet doors, my FB was around 105%. After adding doors, it was around 97%. The general consensus from this gang was that it was best to enlarge the Firebox. So I followed the advice and enlarged it to around 110%. Now, my unit runs like an absolute dream. You've already done a substantial amount of work, might as well make it as perfect as possible. Just my two cents. The others will probably know better than I.

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[Big T]

What is your set up for the WC, just a WC or is there an opening from the FB ?

[MattJ]

It has an opening from the firebox that can be closed like the MACK

[Dirtytires]

I think we would all like to see i a bit bigger but an insulated firebox is a pretty big task to enlarge. The insulation will help prevent heat loss and allow you to get away with a slightly smaller firebox. I would spend the extra effort in insulating the door as well. I think you will be fine but you could always cut down the cookchamber a bit down the road if needed with a false panel.

[Big T]

If you're sure that it's 99.5% then what you have should work fine seeing as it's insulated. Normally we try to oversize the FB just to have a little bit extra if needed but you won't have a lot of heat loss so it's probably close enough. Did you use Pete's calculator to figure the volume of the CC ?

[MattJ]

Yes I used Pete's calculator before and after. If I knew he wanted the racks the same size up front I wouldn't have this to worry about.

Thanks guys for your advice.

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