Risk of carbon monoxide inhalation Natural gas heating systems may cause carbon monoxide poisoning if unvented or poorly vented. Improvements in natural gas furnace designs have greatly reduced CO poisoning concerns. Detectors are also available that warn of carbon monoxide or explosive gases such as methane and propane.US Consumer Product Safety Commission, Non-Fire Carbon Monoxide Deaths, 2011 Annual Estimate, September 2014.
Risk of carbon monoxide inhalation Natural gas heating systems may cause carbon monoxide poisoning if unvented or poorly vented Improvements in natural gas furnace designs have greatly reduced CO poisoning concerns Detectors are also available that warn of carbon monoxide or explosive gases such as methane and propaneUS Consumer Product Safety Commission Non-Fire Carbon Monoxide Deaths 2011 Annual Estimate September 2014