The shelter should be located so that there is no combustible material directly outside it.

"The wraiths give them everything except combustible material," he had said.

Would fires be in urban areas, with presumably more combustible material?

It contained a substantial amount of combustible materials, said a fire officer.

The fire laws ban outdoor cooking within 10 feet of any combustible material.

Some exhaust every combustible material within reach just to get it going.

Heaters should be situated at least three feet away from all combustible materials.

Americans instead put it in a separate chamber filled with combustible materials.

The combustible material is not powder, as we know it.

The windowless space was set below ground level and had been cleared of all combustible material.