nilnoted thanks,. .. .Think you'll find turning off the recirc fans has the effect of increasing fuel burn.. .. .Taken from 757 MEL. .. .When one recirculation fan is turned off, or is inoperative, the pack automatically goes to the high flow mode thus increasing fuel burn. Flight planning fuel should be increased by 0.3 % when dispatching with one recirculation fan inoperative.. . . . <small>[ 12 March 2002, 15:19: Message edited by: Golden Rivet ]</small>