According to Rod Speed :
You can't be certain something won't go wrong with the dryer

You can be certain it wont be producing
CO, they dont go wrong like that.

Sure they do. Any combustion appliance is capable of producing
CO given the right circumstances. If it burns carbon containing
fuel, it's possible to malfunction into producing CO.

My mother was on a coroner's inquest about someone who died
from CO poisoning.

Because of dustbunnies obstructing a natural gas appliance's
air supply.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.