Those "stupid things people do" keeps my hubby in his job (fire fighter) . Came home one night shaking his head about a pellet stove install, used dryer vent for the exhaust. Saved the house but lost the wall where the stove was "installed", not sure how much smoke damage, no one injured. Even the worst manuals provide clear details for install ... don't get it
FWIW i applaud the fine work of your hubby and firefighters everywhere, we in the industry would prefer a different catalyst to set them in motion