Kamado Joe GasJoe GJ26 Owner's Manual page 10

Built-in Installations
Clearances from Combustible Construction
A minimum of 18" from the sides and rear of the grill must be maintained
to adjacent vertical combustible construction, above the counter top
level. You should take into account that there is a large volume of heat,
and smoke that will exhaust from the rear of the grill. This may discolor or
damage unprotected areas (Figure 02). Do not install under unprotected
combustible construction without using a fire safe ventilation system. A
minimum clearance of 18" must also be maintained under the counter top to
combustible construction (Figure 01 and Figure 02).
Figure 1
Figure 2
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