MaxxFan Plus Manual Lift 4000Ki Roof Vent Review for Campervans and Caravans

From our experience (and you've probably noticed it too), the passive ventilation that comes pre-installed in most caravans and motorhomes is rarely enough to keep the interior cool. For optimal comfort — especially here in Australia — you'll need an active vent like the MaxxFan Plus mounted on your vehicle.

Places like Onslow can get extremely hot (reaching up to 50.7°C in 2022), making it almost impossible for your van to cool naturally, even with the windows open. With one or two active vents installed, however, you can enjoy reliable, controllable airflow in any weather.

The MaxxFan Plus is one of the best low-voltage fan vents for campervans, caravans and motorhomes you'll ever come across. In this review, we'll focus on the MaxxFan Plus Manual Lift 4000Ki — a manually operated vent that still includes a smart Auto Mode to automatically open the lid and run the fan to keep your room cool.

MaxxFan Plus Manual Lift 4000Ki: Overview and Specifications

The MaxxFan Plus is one of the most talked-about rooftop fan vents in the caravanning and RV community. It's a premium ventilation system made by MaxxAir, a leading manufacturer of ventilation solutions for adventure vehicles.

The MaxxFan Plus comes in two primary models — electric and manual. The MaxxFan Plus Manual Lift 4000Ki is the manual model, featuring a vent lid that can only be opened by hand. To open the lid, you simply use the integrated knob — rotating counter-clockwise to open or clockwise to close.

With the lid open, you can allow natural airflow into your camper — or turn on the integrated 12V fan for enhanced performance. The fan features 10 blades and offers 10 variable speed settings, easily adjusted via the built-in keypad.

Moreover, the fan is reversible, allowing you to either extract air from or circulate air into your campervan. It can also operate with the lid open or closed, keeping your van's interior fresh and cool in all weather conditions. Here's a summary of the key specifications:

Full Review: How Does the Manual MaxxFan Plus Perform in the Real World?

What's in the Box

• Manual fan unit: The main component with an integrated vent lid, 12V fan, locking knob, flush-mounted keypad and removable insect screen. It also features a moulded flange for installation and built-in tabs to attach a FanMate Vent Cover (optional accessory).
• Interior garnish ring: The trim piece that mounts inside your camper, giving the fan's wires and cut-out a neat, professional finish. It also helps improve airflow efficiency.
• Installation supplies: A printed product manual, installation guide, 20 mounting screws and electrical connectors.

Design and Styling

This is a large roof vent fan designed to improve airflow in medium to large vans. It fits perfectly into a 14 x 14-inch roof cutout, so you can easily install it into an existing standard rooftop vent opening without any modifications.

The fan comes in a white finish, offering a classic, clean look that complements both traditional and modern interiors. Even the interior trim is styled in white to match, giving your ceiling a crisp, fresh appearance.

Durable Construction

Like every other MaxxAir product we've tested, this unit feels premium and well-built. It's made from heavy-duty, UV-resistant plastic, ensuring long-lasting performance under Australia's harsh weather conditions.

The fan features two solid lift arms that raise and hold the lid securely when open. These arms keep the vent lid stable even while driving or when parked in windy conditions — no flapping or rattling.

How Easy Is It to Install?

Installation is very simple, especially if your campervan already has an old passive roof vent. All you need to do is remove the old vent, clean and prepare the cutout area, insert the new MaxxFan and secure it.

The kit comes with 20 mounting screws — sixteen for securing the unit along the flange and four for attaching the garnish ring to the ceiling. You'll only need basic tools (like a drill and screwdriver or rattle gun) and sealant.

Power Requirements

After installation, you can power the fan directly from your 12V battery system — connected to the battery busbars, fuse panel, or spliced into a nearby accessory circuit (such as interior lighting).

MaxxAir recommends a minimum 12V @ 5A for optimal startup and performance under heavy load. However, during our tests, the fan drew only about 3.5 amps on the highest setting.

Controls: Knob and Keypad

Though manually operated, this vent is remarkably easy to use thanks to its integrated control knob and flush-mounted push-button keypad.

Using the control knob: The knob lets you open or close the vent lid. Simply pull the knob to unlock, then rotate counter-clockwise to open or clockwise to close. Once positioned, push the knob back in to lock it — keeping the lid secure while driving or parked against strong winds. The locking mechanism is also convenient for holding the lid in a partially open position.

Using the keypad: The keypad includes five intuitive buttons:

• Fan speed: Use the "+" and "−" triangle buttons to increase or decrease fan speed in both open-lid and closed-lid modes. During our tests, the fan emitted two quick beeps upon reaching the lowest or highest setting.
• Airflow direction: Use the button with reverse arrows and "IN/OUT" initials to reverse airflow direction, switching the fan to the opposite mode from the last setting.
• Auto Mode: Use the "AUTO" button (marked "HOLD TO SET") to program the fan to maintain a 26°C temperature inside your van. The fan automatically starts or stops once the thermostat reaches the preset value.
• Power switch: Use the button with the power icon and "ON/OFF" label to turn the fan on or off, and to exit Auto Mode.

Airflow Performance

If you're upgrading from a cheap vent fan, you'll immediately notice the difference. According to the spec sheet, the fan delivers over 900 CFM (cubic feet per minute) of airflow — a seriously powerful output.

In our hands-on test, it kept our van cool and fresh within minutes. Remember, the fan is reversible, so you can use it to either push air into or out of the van. It also works as a ceiling air circulator with the lid closed (ceiling fan mode) — a nice feature when your room is already cool but you want to maintain balanced temperatures by mixing warm and cool air.

How Much Power Does It Use?

As a 12V accessory, this roof vent connects directly to your DC battery system with no inverter or DC-DC conversion needed — unlike bulkier air conditioners. Our power tests showed it consumes only 3.5 amps at full speed, meaning about 35 amp-hours over ten hours of continuous use (3.5A × 10h).

We didn't get to test the power consumption at every one of the ten speed levels, but the five we tested were as follows:

• Speed 1: 0.14A
• Speed 4: 0.6A
• Speed 5: 0.8A
• Speed 8: 2.0A
• Speed 10: 3.5A

Rainwater Protection

This vent is built for all-weather ventilation. Its integrated lid serves as both the fan guard and rain cover, preventing water from entering your van during storms, while the top rim features a rugged gasket that ensures a watertight seal when closed.

For best waterproofing results:

1. Apply a strip of butyl tape to the underside of the fan flange before installation.
2. After securing the fan, seal around the outer flange edge and over all screw heads with a quality sealant.

The unit also includes moulded tabs for attaching a FanMate Vent Cover (sold separately). This optional cover allows you to keep the lid open for better ventilation during rain.

Simple Maintenance

Maintenance is straightforward. The interior garnish ring has a smooth finish that wipes easily with a damp cloth, and the debris/insect screen can be removed for thorough cleaning.

Unlike other MaxxAir models (such as the Dome series), this screen requires no tools for removal — just rotate the retainer knobs about 180 degrees to release it.

Tip: MaxxAir explicitly warns against using caustic or solvent-based cleaners and products containing petroleum additives. Use only mild detergent and water during cleaning.

MaxxFan Plus Manual Lift Price in Australia

The MaxxFan Plus Manual Lift 4000Ki is an excellent upgrade for keeping your campervan, caravan or motorhome cool and comfortable. It offers everything you need — and nothing you don't.

However, as with most MaxxAir products, expect to pay a bit more for this model's premium build and features. It costs a little over $400 — nearly twice as much as budget alternatives, but more affordable than the electric-lift MaxxFan Plus with advanced features such as automatic thermostats, rain sensors and motorised lids.

Frequently Asked Questions

What size cutout does the 4000Ki need?

It fits a standard 14 x 14-inch (355 x 355 mm) roof cutout, so it can usually replace an existing passive rooftop vent without any modifications.

How much power does it draw?

MaxxAir recommends a minimum 12V @ 5A supply, but in our tests the fan drew only about 3.5 amps on the highest speed (about 35 amp-hours over ten hours), and as little as 0.14 amps on speed 1.

Can it blow air in as well as out?

Yes. The 12-inch, 10-blade fan is reversible, offering both intake and exhaust modes, and it can run with the lid open or closed — including a ceiling fan mode for circulating air.

Does a manual vent still have an Auto Mode?

Yes. Holding the "AUTO" button programs the fan to maintain a 26°C interior temperature — the built-in thermostat automatically starts or stops the fan once the preset value is reached.

Ready to keep your van cool through the Australian summer? Order the MaxxFan Plus Manual Lift 4000Ki in white from Campervan Builders today.