Charcoal has a specific combustion value on the average of 28,900 kJ/kg. Its density is strongly dependent on the wood used in its production. An average value is about 400 kg/m3 according to Earl (1975).

Downdraft Barbeque
Peter Verhaart (Feb 7,99), Water Boiling Tests (Mar 6, 2002)

We have used it quite a few times now (we are not great barbecuers), it is quite convenient to operate. It typically takes 12 minutes to settle into smokeless and odourless combustion, our official propane fired bbq takes longer.

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