HE402 air humidifier – for ventilation systems up to 600–700m³

HE402 is a professional air humidifier for installation in ventilation systems, designed to maintain optimal humidity in plant-growing rooms, greenhouses and other climate-controlled spaces. With the correct water pressure, it provides a capacity of up to 10 litres per hour and is suitable for systems with an airflow of 600–700 m³. It operates without fine mist in the room, humidifying the air efficiently through evaporation.

HE402 is designed for professional applications where precise humidity control is required. It is installed in an air duct with a diameter of Ø200 mm and operates together with a suitable inline fan. For maximum performance, the manufacturer recommends inlet water pressure of at least 2 bar and an incoming air temperature of around 28–30°C. Under these conditions, the system achieves optimal humidification capacity.

The humidifier uses a special evaporative element through which the airflow passes. This allows even humidification without forming free water mist in the room, which is particularly suitable for environments with lighting, electronics and sensitive equipment.

If higher capacity is required, the system can be combined with a booster pump, which raises water pressure to 8 bar. This atomises the water into significantly finer droplets, improving evaporation and increasing humidification efficiency.

For automatic operation, the manufacturer recommends using a humidistat, which simultaneously controls the solenoid water valve, the fan and any booster pump. This way, the humidifier operates only when needed and a stable relative-humidity level is maintained.

Installing an air-distribution sleeve after the humidifier helps distribute humid air more evenly in the room, while using a filter before the fan limits dust accumulation on the evaporative element. An additional benefit of the system is that it also has a slight cooling effect on the air during operation.

Technical specifications

✔️ Type: Duct air humidifier

✔️ Model: HE402

✔️ Installation diameter: Ø200 mm

✔️ Humidification capacity: up to 10 L/hour

✔️ Recommended airflow: 600–700 m³

✔️ Minimum water pressure: 2 bar

✔️ Optimal incoming air temperature: 28–30°C

✔️ Can be used with a booster pump (up to 8 bar)

✔️ Compatible with Ruck RKS 200L inline fan

✔️ Suitable for automatic control via a humidistat.

📦 The kit includes

✔️ 1 × Air humidifier HE402

Note: The fan, humidistat, booster pump and air-distribution sleeve are sold separately unless included in a specific configuration.

Benefits

✔️ Capacity of up to 10 litres of humidification per hour

✔️ Suitable for rooms with a volume of 600–700 m³

✔️ Operates without direct water-mist spraying

✔️ Can be automatically controlled via a humidistat

✔️ Output can be increased with a booster pump

✔️ Helps cool the air during operation

✔️ Easy integration with existing ventilation systems

✔️ Suitable for continuous professional use.

Application

Suitable for:

• Greenhouses

• Seedling production areas

• Ventilation systems

• Climate-controlled rooms

• Storage areas

• Production areas

• Other spaces where optimal air humidity must be maintained.

📋 Instructions for use

1. Install the humidifier in Ø200 mm ducting.
2. Connect the unit to a water supply with a minimum pressure of 2 bar.
3. If necessary, install a booster pump for higher output.
4. Connect the fan and solenoid valve to a humidistat for automatic control.
5. Where possible, use an air-distribution sleeve for more even humidity distribution.
6. Periodically clean the evaporative element and keep the system free of dust build-up for optimal performance.

⚠️ Important: For correct operation, the manufacturer recommends that all electrical components (fan, solenoid valve and booster pump, if fitted) are switched on and off simultaneously via a humidistat. If the fan remains on after the water supply is stopped, humidification will continue for a while due to residual moisture in the evaporative element