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This is a picture of an outflow valve from an airliner pre 1990. The outflow valve lets stale air in the pressurized cabin to escape and new compressed air is being forced in. For those of you who thought smoking and non-smoking sections made a difference, it appears that it didn't. All of that crap is from cigarette smoke.



Outflow Valve Trivia:

If you look at pictures of airliners taken prior to 1990, you might see brown stains around the outflow valve. The stains are from tobacco smoke. Airlines were thrilled when the industry banned smoking. Tar and nicotine gummed up valves, instruments, and sensors causing thousands of dollars a year in damage. Tobacco is really nasty stuff.

My mom ran a bridge center back in the 80's and for anyone who was on the bridge scene back then, about 90% of those people chain smoked. She hired me to clean the center twice a week, part of that was scrubbing the metal air cleaners. I smoked and they grossed me out, thick and black with tar and a horrendous smell you wouldn't beleive.
I caddied a few tournaments and it was unbeleivable how much those people smoked.