Ask the Experts: Just Needed to Vent
“With regards to gas dryers, is there any concern for CO if they are vented inside, or is it solely a moisture issue?”
All products of combustion, ie: water vapor, carbon monoxide, CO, nitrogen oxides (NOx), sulfur dioxides (SOx), carbon dioxide (CO2), etc, etc, are occupant safety and home durability issues. All combustion appliances should be properly vented to the exterior, including gas dryers.
To me the larger issues appear to be:
1. dryer exhaust (gas or electric) is not a proper means for house humidification.
> a dry home generally means excessive air leakage
2. dryer exhaust constituents are unhealthy to ingest
> besides the obvious carcinogens, unknown human effect from compound interactions
3. all combustion appliances should be vented to the exterior, including dryers.
> dryers should have “diverter’s” removed and where possible – hard duct installed with taped joints – no screws, exhausting to an accessible (for periodic cleaning) exterior termination.
Answer provided by Kevin Brauer, Building Analyst at the Center for Energy and Environment.