RandomFire.lua

 function RandomFire(zonetable,Tstart,dT,Duration,minimumDurationFire,maximumDurationFire)
	 local zonetable = zonetable
	 local Tstart = Tstart or 0
	 local dt = dt or nil
	 local Duration = Duration or nil
	 local minimumDurationFire = minimumDurationFire or 600
	 local maximumDurationFire = maximumDurationFire or 3600

		 function SelectZone()
			 local varZone = math.random(1,#zonetable)
			 local FireZone = zonetable[varZone]
			 local FireZone = ZONE:New(FireZone)
			 
			 StartAFire(FireZone)
		 end
	 local firecoord = nil 

		function StartAFire(FireZone)
			local rnd = math.random(1,8) -- Smoke size 1 = small smoke and fire; 8 = huge smoke
			firecoord = FireZone:GetRandomCoordinate() -- Core.Point#COORDINATE
			firecoord:BigSmokeAndFire(rnd, nil, nil)
			

			local fireDuration = math.random(minimumDurationFire,maximumDurationFire)
			local endFire=TIMER:New(EndAFire,firecoord)
			endFire:Start(fireDuration)
			
		end

		function EndAFire(firecoord)
		  firecoord:StopBigSmokeAndFire()
		end

	local startFire = TIMER:New(SelectZone,zonetable,minimumDurationFire,maximumDurationFire)
		startFire:Start(Tstart,dT,Duration)
end


-- RandomFire({Table with zones},start first fire,delta between fire,end all fires, minimumDurationFire , maximumDurationFire)
RandomFire({"Fireplace1","Fireplace2","Fireplace3"},600,120,10000,600,3000)