Sorry Monkee, but ITN have probably got it right.. .On the older types we were always encouraged to operate with one of the three packs shut down (in theory to save fuel) and on the modern types the recirculation fans are required to run continuously to reduce the bleed demand from the engines (again to save fuel).. .. .The net result is to reduce the rate at which air is changed in the cabin and that, it can be argued, is not good for the long term health of our pax and cabin crew.. .. .Let us not forget that tuberculosis has made a return. As that can be transmitted through airborne particles..... . . . <small>[ 13 March 2002, 15:54: Message edited by: Lou Scannon ]</small>