737 Recirc Fans
I have seen the Recirc Fans configured in various combinations jumpseating. I have seen the Flight Deck Off, Cabin On - Flight Deck On, Cabin Off. Both Off on external air. Have not seen them both Off airborne. They both can be MELed unless in very very hot ambient.
I notice when I Non-Rev the Cabin is VERY drafty - many folks grabbing sweaters etc - me included.
What techniques do you 737 drivers use in managing the Recirc Fans? Does running them Off do any harm? More fuel use? Will Off make the Cabin less drafty?
Marsea