Proper ventilation is essential in your adventure van to maintain clean air quality and maximum comfort. Your new camper may come with a passive air vent for natural airflow, but a fan-assisted roof vent is a far better choice for faster cooling and effective removal of stale air.
As the name suggests, this type of roof vent includes an integrated fan system that actively draws in or expels air. The system typically consists of a fan blade and motor that can rotate clockwise, counterclockwise, or in both directions.
At Campervan Builders, we offer a wide range of low-voltage fan vents for campervans, caravans, RVs, and motorhomes. In this guide, we'll walk you through 14 key factors to help you choose the perfect one for your setup β with your van's specific needs being the most critical, since they determine the right type of vent, airflow capacity, directionality, and features.
Why Should You Get a Fan-Assisted Roof Vent for Your Caravan or Campervan?
Thanks to the built-in fan system, a fan-assisted roof vent provides far better airflow than a passive (non-powered) vent. This improves moisture control, temperature regulation, odour removal, and overall ventilation efficiency.
Moisture Management
A fan-assisted roof vent helps expel excess water vapour from your van, preventing condensation and humidity that promote mould, mildew, and fungus growth.
Temperature Regulation
A roof vent helps expel hot air and draw in fresh, cool air, keeping your interior comfortable. Modern fan-assisted vents β such as the MaxxFan Deluxe β even feature an auto mode that maintains your preferred temperature automatically.
Odour and Smell Removal
A powered roof vent efficiently removes stale odours, smells, smoke, and fumes from your van β replacing them with fresh air for a cleaner, more breathable environment.
Overall Ventilation Benefits
Ventilation encompasses all aspects of moisture control, temperature regulation, and odour or gas expulsion. In general, fan-assisted roof vents significantly improve airflow in and out of your camper, drawing in cool, fresh air while removing stale air, odours, excess heat, and humidity.
What Should You Look for in a Caravan Roof Vent? 14 Crucial Factors
Below are fourteen key factors to consider before purchasing a fan-assisted roof vent for your adventure vehicle.
1. Why You Need a Roof Vent
The first thing to evaluate before buying any fan-assisted roof vent is why you need one. Are you looking for a ventilation system to improve airflow, manage moisture, regulate temperature, or expel unpleasant smells and odours?
Once you have a clear reason for needing a roof vent, you'll be better positioned to choose the right type and features for your van.
Takeaway: At Campervan Builders, we offer a wide range of fan-assisted roof vents in various designs and configurations, ensuring you get the right model for your ventilation needs.
2. Compatibility with Your Vehicle
After identifying your needs, assess the available mounting area on your roof. This is essential because roof vents come in different sizes, each designed for specific cutouts and roof thicknesses.
You must also consider the vent's overall dimensions to ensure it fits properly without compromising other rooftop accessories.
Takeaway: Our roof air vents are available in multiple sizes. The most compact model requires only a 6ΒΌ-inch cutout, while others fit the standard 14 x 14-inch opening.
3. Build Quality and Durability
Once you confirm compatibility, focus on the build quality of the roof vent. Since the unit is mounted externally, it must withstand harsh UV rays, hail, falling debris, and general wear from long-term exposure. Its fan should endure continuous operation without failure.
Choose a vent made from rugged polycarbonate, which offers excellent impact and UV resistance for superior durability. Likewise, ensure the fan mechanism is well-constructed for long life and reliable performance, even under high temperatures or prolonged use.
Takeaway: The best way to verify a product's durability is by checking its warranty coverage. For example, some of our premium roof vents come with a lifetime warranty on the lid and two years for the fan assembly.
4. Fan Power Requirements
Campervans, caravans, RVs, and motorhomes use different electrical systems β 12V, 24V, or 48V. For convenience, choose a low-voltage fan vent that matches your vehicle's battery system. Otherwise, you may need a DCβDC power converter.
Also, ensure the vent consumes minimal power to conserve battery life. The last thing you want is a fan that drains your battery bank within hours.
Takeaway: Our fan roof vents are energy-efficient, drawing as little as under 1 amp to around 4 amps, depending on the model.
5. Type of Fan Motor
Few people realise that roof vent fans use different types of motors. The two most common are sleeve-bearing and ball-bearing motors.
- Sleeve-bearing motors are affordable and quiet thanks to their low-friction design with minimal metal-to-metal contact. However, they're less durable and not ideal for demanding environments.
- Ball-bearing motors, on the other hand, deliver smoother and more efficient operation. They perform well in high temperatures and last longer, but may produce slightly more noise and come at a higher cost.
Takeaway: Our premium roof vents feature encased ball-bearing motors for powerful, long-lasting, and reliable ventilation.
6. Fan Airflow Capacity
Once you've selected the motor type, consider the airflow capacity, measured in CFM (cubic feet per minute) or CMM (cubic metres per minute).
To determine your ideal airflow, calculate the volume of the area to be ventilated. For example, a 900-cubic-foot space typically requires about 900 CFM for one full air exchange per minute.
Takeaway: Campervan Builders offers a wide selection of roof vents with varying airflow capacities to suit all camper sizes. Below are some examples:
- Black Manual Lift Maxxfan Dome 12V Roof Vent: features a 0.7A power draw and 200 CFM (approximately 5.67 CMM) airflow capacity
- White Manual Lift Maxxfan Dome Plus 12V Roof Vent: features a 0.7A power draw and 200 CFM (approximately 5.67 CMM) airflow capacity
- CVB-RVM5000 Manual Lift 12V Roof Vent: features a 1.6A power draw and 25.76 CMM (approximately 909.71 CFM) airflow capacity
- CVB-RVE-6000 Remote Electric Power Lift 12V Roof Vent: features a 2A power draw and 25.76 CMM (approximately 909.71 CFM) airflow capacity
- CVB-RVM-5000-AIR Manual Lift 12V Roof Vent: features a 1.6A power draw and 25.76 CMM (approximately 909.71 CFM) airflow capacity
- CVB-RVE-6000-AIR Remote Electric Power Lift 12V Roof Vent: features a 2A power draw and 25.76 CMM (approximately 909.71 CFM) airflow capacity
- CVB-RVM280-White Manual Lift 12V Shower Roof Vent: features a 0.3A power draw and 6 CMM (approximately 211.89 CFM) airflow capacity
- CVB-SRV280-LED Manual Lift 12V Shower Roof Vent: features a 1.2A power draw and 6 CMM (approximately 211.89 CFM) airflow capacity
- White Maxxfan Plus 4000ki Manual Lift 12V Roof Vent: features a 3.5A power draw and 900+ CFM (or 25.49+ CMM)
- White Maxxfan Plus 4540KI Electric Power Lift 12V Roof Vent: features a 3.6A power draw and 900+ CFM (or 25.49+ CMM)
- White Maxxfan Deluxe Rain Dome Manual Lift 12V Roof Vent: features a 3.6A power draw and 900+ CFM (or 25.49+ CMM)
- Black Maxxfan Deluxe Rain Dome Electric Power Lift 12V Roof Vent: features a 3.8A power draw and 900+ CFM (or 25.49+ CMM)
7. Fan Operation Direction
Next, determine the airflow direction. Roof vent fans can be designed for intake, exhaust, or both (reversible).
- Intake fans draw in fresh air to improve overall air quality.
- Exhaust fans expel hot, stale, or humid air from the interior.
- Reversible fans do both, offering the best versatility.
Takeaway: At Campervan Builders, we supply all three types β intake, exhaust, and reversible β so you can choose the perfect option for your application.
8. Fan Operation Speeds
Fan speed control plays a big role in effective ventilation. A multi-speed fan allows you to adjust airflow as needed β high speed for rapid ventilation and low speed for quieter operation once the cabin cools.
Generally, the more speed settings a fan has, the more control you gain over airflow, energy efficiency, and noise levels.
Takeaway: Our collection includes fan vents with varying speed options β single-speed, three-speed, four-speed, and ten-speed models β to suit your comfort and energy needs.
| Power Consumption | Airflow Capacity | Fan Directionality | |
|---|---|---|---|
| Maxxfan Dome Roof Vent | 12V @ 0.7A | 200 CFM | Exhaust Only (1 speed fan) |
| Maxxfan Dome Plus Roof Vent | 12V @ 0.7A | 200 CFM | Exhaust Only (1 speed fan) |
| CVB-RVM5000 Roof Vent | 12V @ 1.6A | 25.76 CMM | Intake/Exhaust (3 speed fan) |
| CVB-RVE-6000 Electric Roof Vent | 12V @ 2A | 25.76 CMM | Intake/Exhaust (3 speed fan) |
| CVB-RVM-5000-AIR Roof Vent | 12V @ 1.6A | 25.76 CMM | Intake/Exhaust (3 speed fan) |
| CVB-RVE-6000-AIR Electric Roof Vent | 12V @ 2A | 25.76 CMM | Intake/Exhaust (3 speed fan) |
| CVB-RVM280-White Shower Roof Vent | 12V @ 0.3A | 6 CMM | Intake/Exhaust |
| CVB-SRV280-LED Manual Shower Roof Vent | 12V @ 1.2A | 6 CMM | Intake/Exhaust (3 speed fan) |
| Maxxfan Plus 4000ki Manual Lift Roof Vent | 12V @ 3.5A | 900+ CFM | Intake/Exhaust (10 speed fan) |
| Maxxfan Plus 4540KI Electric Power Lift Roof Vent | 12V @ 3.6A | 900+ CFM | Intake/Exhaust (10 speed fan) |
| Maxxfan Deluxe Rain Dome Manual Lift Roof Vent | 12V @ 3.6A | 900+ CFM | Intake/Exhaust (10 speed fan) |
| Maxxfan Deluxe Rain Dome Electric Power Lift Roof Vent | 12V @ 3.8A | 900+ CFM | Intake/Exhaust (10 speed fan) |
9. Auto Thermostat Mode
A fan roof vent with a built-in thermostat sensor and smart auto mode is essential for maintaining your van's air quality. It automatically powers on and adjusts fan speed based on your camper's interior temperature.
One key benefit of auto mode is hands-free operation, meaning you won't need to manually adjust the controls. It also helps maintain comfortable temperatures at all times and conserve battery power, as the fan only runs when needed.
Takeaway: We offer a range of low-voltage fan vents with built-in thermostats and auto mode. Depending on the model, the auto mode may be basic (factory-default settings) or advanced (with both factory preset and user-customisable settings).
10. User-Friendly Controls
The roof vent you choose should be easy for all occupants to operate (except young children). Not everyone can reach the ceiling, so a model with a remote control or wall-mounted switch can be especially convenient.
That said, the fan controls should be positioned out of reach of young children to prevent accidental operation β helping extend the fan's lifespan and improve energy efficiency.
Takeaway: All roof air vents in our store feature ceiling controls, while some models also include a handheld remote control for added convenience.
11. Rain-Proof Operation
When selecting a roof vent for your adventure vehicle, consider a model that operates in both open-lid and closed-lid positions. If your budget allows, opt for a vent that supports open-lid operation even during rain, ensuring consistent ventilation in all weather conditions.
Takeaway: Our current range of roof vents can operate in both open-lid and closed-lid modes. Some models also include a smart rain sensor that automatically closes the lid upon detecting moisture. Then, the premium Maxxair collection with built-in rain protection allows safe open-lid operation even in wet weather.
12. Insect Screen Mesh
The last thing you want is bugs or debris entering your van. Always ensure the roof air vent you choose includes a screen mesh to block insects and airborne particles. Depending on the model, the mesh may be removable or non-removable for cleaning convenience.
Takeaway: All our fan roof vents come with an integrated screen mesh. In most models, the mesh is removable for easier maintenance.
13. Operation Noise Level
Noise level is another important factor to consider when choosing a roof vent for your campervan, caravan, RV, or motorhome. A quiet fan ensures better sleep quality and allows you to relax or work from your van without distractions.
Takeaway: All fan roof vents available in our store are engineered for quiet operation, providing maximum peace of mind whether you're working, relaxing, or sleeping.
14. Ease of Installation
If you plan to install the vent yourself, look for a DIY-friendly design. The best vents include straightforward installation instructions, require only basic tools, and come with essential mounting components such as screws.
Takeaway: All roof air vents available in our store feature an easy, DIY-friendly design. They may include the necessary mounting components, so you'll only need a few basic tools and a quality sealant for installation.
Don't Forget About the Warranty and Serviceable Parts
When purchasing a fan roof vent for your campervan, caravan, or motorhome, following these 14 factors will help you choose a high-performance, reliable, efficient, and durable model.
But as mentioned earlier, warranty coverage is one of the best indicators of a vent's durability. For instance, some of our roof air vents come with a lifetime warranty. Even better, these models feature serviceable parts that you can easily replace when needed β extending the lifespan of your investment.
Frequently Asked Questions About Caravan Roof Vents
What size cutout does a caravan roof vent need?
It depends on the model. The most compact vent in our range requires only a 6ΒΌ-inch cutout, while others fit the standard 14 x 14-inch opening. Always measure your available roof area and check the vent's cutout requirement before buying.
How much power does a 12V roof vent fan draw?
Fan-assisted roof vents are energy-efficient, drawing as little as under 1 amp up to around 4 amps depending on the model. For example, the Maxxfan Dome draws 0.7A for 200 CFM, while the Maxxfan Deluxe models draw 3.6β3.8A for 900+ CFM.
Can I leave a roof vent open in the rain?
Some models include a smart rain sensor that automatically closes the lid when it detects moisture, while the premium Maxxair collection with built-in rain protection allows safe open-lid operation even in wet weather.
Which is better: a sleeve-bearing or ball-bearing fan motor?
Sleeve-bearing motors are affordable and quiet but less durable in demanding environments. Ball-bearing motors run more smoothly and efficiently, perform well in high temperatures, and last longer, though they may be slightly noisier and cost more.
Ready to breathe easier on the road? Explore our full range of low-voltage fan vents and find the perfect fan-assisted roof vent for your campervan, caravan, or motorhome.
