due to smaller ventilation holes to the top, plus the top section being an insulated flue the absolute max i would expect coming out of the enclosure is 60C and could possibly be only 50C. id rather have metal pipe from the enclosure down to the fans but it shouldnt be that hot that i need to keep it away from timber etc...
as always i test very thoroughly and i will know the actual temp next days off and build it with a higher than actual temp spec in mind