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How Far Should Generators Be From Open Windows and Doors?

April 5, 2026

Quick Answer

Generators should be at least 20 feet away from open windows and doors to prevent carbon monoxide buildup and ensure safe ventilation.

Safety Regulations and Recommendations

Generators produce carbon monoxide, a colorless, odorless gas that can be deadly in high concentrations. To prevent carbon monoxide buildup, the National Fire Protection Association (NFPA) recommends that generators be at least 20 feet away from open windows and doors. This distance allows for proper ventilation and prevents the accumulation of toxic fumes.

Measuring Carbon Monoxide Levels

To ensure safe generator operation, it’s essential to measure carbon monoxide levels in the surrounding area. A CO detector can be used to monitor levels, and if they exceed 35 parts per million (ppm), it’s time to reposition the generator. The Occupational Safety and Health Administration (OSHA) sets a permissible exposure limit (PEL) of 50 ppm for up to 8 hours, but even lower levels can be hazardous.

Additional Safety Precautions

In addition to maintaining a safe distance, generators should be installed in well-ventilated areas, away from fuel sources and ignition sources. Ensure that the generator is properly maintained and regularly serviced to prevent malfunctions that could lead to carbon monoxide buildup. Always follow the manufacturer’s instructions and local regulations for generator installation and operation.

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