Can You Run a Generator Indoors?
Understanding Generator Safety
At GFE Power Products, we supply high-quality, brand-new diesel generators to customers across the UK and beyond. Whether you're purchasing a generator for home backup, a commercial site, or an industrial application, one question always comes up, can I run a generator indoors?
The short and serious answer: absolutely not. Running a generator indoors is extremely dangerous and can be fatal. In this article, we’ll explain why generators must never be used indoors, the safety risks involved, and how to operate your generator safely and effectively, so you get reliable power without compromising your wellbeing.
Why Indoor Generator Use Is So Dangerous
Generators, especially diesel and petrol models, produce carbon monoxide (CO), an invisible, odourless gas that can kill in minutes. Even with windows open or fans running, using a generator inside a garage, basement, shed, or other enclosed space can cause CO to build up rapidly.
According to the Health and Safety Executive (HSE) in the UK, carbon monoxide poisoning is a leading cause of generator-related deaths. This applies not only to domestic users but also to tradespeople, farmers, and contractors using portable generators on worksites.
At GFE, safety is a core part of how we advise our customers. Whether you're investing in a home backup generator or a large-scale Baudouin diesel generator for industrial use, it’s essential to know how to run it properly.
Where Should You Run a Generator?
To operate safely, generators must be used outdoors, at least 5 metres (15 feet) away from windows, doors, vents, or any opening to your building. Here’s how to position them correctly:
- Place the generator on a dry, level surface
- Use a canopy or weatherproof cover to protect it from rain, but ensure full ventilation
- Keep exhaust outlets directed away from the building
- Do not run generators in garages, sheds, crawlspaces, or tents, even with open doors
If you need backup power in harsh environments, our range of weatherproof diesel generators is built for reliable outdoor use and can be paired with sound-attenuated enclosures for residential or urban settings.
Portable vs. Standby Generators: Safety Considerations
Portable Generators
Often used for short-term needs or on worksites, portable generators are particularly high-risk because people frequently use them in semi-enclosed areas during bad weather.
Best practice: Always use a heavy-duty outdoor-rated extension lead, never bring the unit indoors, and always install a carbon monoxide alarm in nearby occupied spaces.
Standby Generators
Our Cummins-powered generators are designed for permanent installation and connect to your home or building through a transfer switch.
These generators:
- Are fixed outdoors in secure enclosures
- Automatically start during outages
- Can safely power your property with no need to move or manually start the unit
You can read more in our related article: Why Installing a Transfer Switch Is Essential for Your Home Generator.
What If You Need Power in an Enclosed Environment?
In environments where combustion engines are unsuitable, such as underground sites, enclosed warehouses, or event tents, the solution isn’t to run a diesel generator inside. Instead, consider:
- Remote placement of the generator outside the space, with long cable runs
- Ventilation solutions to prevent gas build-up
- Battery backup or inverter systems for indoor use (for low power requirements)
- Consulting our team for custom safety setups with appropriate safety clearances, contact us
If you’re planning a bespoke installation in a sensitive or restricted area, get in touch with us to discuss your project. We can guide you on the right setup to keep your power secure and safe.
Why Carbon Monoxide Is So Dangerous
Carbon monoxide (CO) is often called the "silent killer", and for good reason. It's an invisible, odourless gas that can build up quickly without warning. If a generator is used incorrectly, especially indoors or too close to your home, CO can seep inside and put lives at risk.
Some of the early signs of carbon monoxide poisoning include:
- Headaches
- Dizziness
- Feeling sick or vomiting
- Shortness of breath
- Weakness or confusion
- Chest pain or fainting
These symptoms can come on suddenly and may be mistaken for other illnesses. But make no mistake: CO poisoning is a medical emergency.
If you or anyone nearby experiences these symptoms while a generator is running, switch it off immediately (if safe to do so), leave the area, and call emergency services.
To reduce the risk at home, we always recommend installing carbon monoxide detectors near bedrooms and any walls adjacent to your generator’s location. These alarms could save your life, and are just as important as smoke alarms in properties with backup power.
Generator Safety Tips from GFE Power Products
To ensure safe generator operation, follow these top tips:
- Never run a generator indoors or in a semi-enclosed space
- Keep generators dry and elevated during operation
- Always use a transfer switch for home backup power
- Service your generator regularly- explore our diesel generator maintenance tips
- Choose the right generator for the application- our team can advise on sizing and specification
At GFE Power Products, all of our new generators are sourced from trusted manufacturers and built to meet UK safety and emissions standards, including relevant ISO and CE certifications.
Invest in Safe, Reliable Backup Power
When it comes to generators, performance and safety go hand in hand. At GFE Power Products, we help homeowners, facilities managers, and contractors get the backup power they need, without taking risks.
From selecting the right size and output to arranging delivery and providing expert advice on installation and operation, we’re with you every step of the way.
Explore our full range of new diesel generators, or speak with our expert team for tailored recommendations.
Safety Is Power
Running a generator indoors isn’t just a bad idea, it’s a potentially life-threatening mistake. Always operate your generator outdoors, with proper ventilation, and use the right accessories like a transfer switch and CO alarms to ensure complete peace of mind.
Safe generators are effective generators. And at GFE Power Products, we don’t just sell equipment- we supply peace of mind.
Phone: +44 (0)1386 335007
Email: sales@gfepowerproducts.com
