I am certainly not an expert but I'm basing this off of a discussion in the airliners.net forum among users who generally know what they're talking about: "Quo

I am certainly not an expert but I'm basing this off of a discussion in the airliners.net forum among users who generally know what they're talking about: "Quoting nupogodi (Reply 178): Now, mandala, I have another question for you: I have heard that the outflow valves will not allow cabin altitude to drop below 14000ft as long as bleed air is working. Can you confirm or deny that? Is it possible to completely depressurize the aircraft without turning off in the "inflow" (don't know the jargon) ? If so, wouldn't the flight deck and cabin quickly grow incredibly cold? Or do you think intentional decompression is a valid hypothesis?" "Turn pressurization to manual, open the valves... it will depressurize... Wanna make it quicker, just turn off the bleeds too (inflow)... Just pressing a few buttons... the longer button is the outflow valve in manual... Mandala499" If anyone has information proving otherwise, I'd definitely be interested to hear it. Certainly a bit of a scary thought.