Carbon monoxide and generators

Why generator exhaust is dangerous

Carbon monoxide is an invisible, odorless poisonous gas produced by fuel combustion. Generator exhaust can carry it into occupied spaces. You cannot establish safety by deciding that the exhaust smell is faint or absent. [2]

Possible symptoms include headache, dizziness, weakness, nausea, vomiting, chest pain, and confusion. Severe exposure can cause loss of consciousness and death. CDC notes that people who are asleep or impaired can die before recognizing symptoms. Treat suspected exposure as an emergency rather than waiting for a symptom pattern to become certain. [2]

Portable generators belong outdoors

CPSC says to operate portable generators outdoors only, at least 20 feet from homes, with exhaust directed away. CDC says to keep them more than 20 feet from doors, windows, and vents. Also consider openings and occupied spaces on neighboring properties. [2][3]

Never run a portable generator in a house, garage, basement, crawlspace, shed, or other enclosed or partially enclosed location. Open windows, garage doors, and fans do not make these spaces safe. Do not move a portable generator indoors to protect it from weather. [4]

Alarms and automatic shutoff are additional protection

CPSC recommends battery-operated CO alarms or alarms with battery backup on every level of the home and outside sleeping areas. Follow the alarm manufacturer's installation, testing, and replacement instructions. An alarm is a warning system, not permission to use equipment unsafely. [1][3]

A generator's CO shutdown feature is also additional protection. It does not change the outdoor-placement rules or justify bypassing the protective system. If an alarm activates, evacuate and call emergency services; troubleshooting comes after the immediate danger is addressed. [6]

Installed standby systems need their own assessment

The portable-generator 20-foot guidance is not a universal setback specification for permanently installed standby equipment. A standby installation must follow the exact model's installation instructions and applicable codes, including exhaust exposure, building openings, and service access. Have qualified professionals assess the site. CO alarms remain essential in homes with fuel-burning equipment. [5][7]