Rebuilt this yesterday, originally it was reverse flow and it worked fine but its so small theres no real advantage to it so standard offset it is. Alot of beer went into the original design and alot has been learned sense this one was originally built. Just need to get some new thermometers for my bigger one and this will get the hand me downs. This thing will burn on lump charcoal forever just need to put small chunks in every now and then and your good, or at least thats how itbuse to be befor it got under went surgery.