Wojo,
That is a great idea - using the dryer exhaust pipe to aid in ventilation.  I'm gonna try that next fall.

I use a Mr. Buddy heater - but usually only when I'm getting ready to turn-in or in the morning while getting dressed.
I'm just paranoid about running the thing while I'm sleeping.
I'd feel a bit safer knowing I had positive ventilation using your dryer dust idea.
Thanks for the tip
Chinook

Very interesting topic and a lot of great information....A top line sleeping bag is a must, as for heaters thats another matter. I used an old Coleman heater for years with no problem but always had 2 samll windows open for a cross draft.

Our tent is a nylon one with ventilated top & a rain fly. We get good ventilation so I use a two burner Coleman lantern. It warms the tent up in just a few minutes, but I don't sleep with it on.  
Frank