Generator Carbon Monoxide Safety: Why 20 Feet Matters

A portable generator can power critical equipment, but it also produces carbon monoxide: a colorless, odorless gas that can kill. An open garage door, window, porch, carport, or partially enclosed shed does not make indoor operation safe.

The placement rule

Operate a portable generator outdoors only, at least 20 feet from the home, with the exhaust directed away from the house and any other occupied building. Keep it away from doors, windows, crawl-space vents, soffit vents, and HVAC intakes.

Before starting it

• Read the manufacturer manual and inspect the unit, cords, and fuel system.
• Install working battery-operated or battery-backup carbon-monoxide alarms on every level and outside sleeping areas.
• Use outdoor-rated extension cords sized for the load and protected from damage and standing water.
• Never connect a generator directly to household wiring unless a qualified electrician has installed an approved transfer switch.
• Let the generator cool before refueling. Store fuel only in approved containers and away from living areas and ignition sources.

Know the warning signs

Headache, dizziness, weakness, nausea, vomiting, sleepiness, and confusion can indicate carbon-monoxide exposure. If an alarm sounds or exposure is suspected, move everyone to fresh air immediately and call 911. Do not re-enter to find the source.

Make the setup repeatable

Measure a safe outdoor location now. Store the correct cords, a weather-safe operating plan, fuel documentation, and the generator manual together. A generator should never be improvised into service during a storm.