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Products
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Helios Fans VK 250
The Helios VK 250 is a flat-style overpressure shutter engineered for 250mm diameter air outlets. Designed to automatically open when the fan starts and close when it stops, this shutter effectively prevents backdrafts and environmental ingress such as dust or insects. It supports a maximum airflow velocity of 8 m/s, making it suitable for a wide r ...
Helios Fans VK 30/15
The Helios VK 30/15 is a compact, flat-style overpressure shutter designed for automatic control of air outlets. It opens and closes in sync with the fan operation — opening when the fan is active and closing when it stops — helping to prevent unwanted air return and maintain system efficiency. Capable of handling airflow velocities up to 8 m/s, this s ...
Helios Fans VK 315
The Helios VK 315 is a flat-design overpressure shutter engineered to regulate airflow at 315mm air outlets. It automatically opens when the fan is running and closes when the fan is off, helping to prevent backdrafts, dust ingress, and unwanted air exchange. Built for airflow velocities up to 8 m/s, this shutter ensures reliable performance in res ...
Helios Fans VK 355
The Helios VK 355 is a flat-design overpressure shutter designed for 355mm air outlets, offering automatic opening and closing in sync with the operation of the connected fan. This mechanism prevents backdrafts and protects against dust and outdoor air entering the system when the fan is off. Capable of handling airflow speeds up to 8 m/s, the VK 3 ...
Helios Fans VK 40/20
The Helios VK 40/20 is a compact, flat-design overpressure shutter built for ventilation systems with 400×200 mm air outlets. Designed to automatically open and close with the fan’s operation, it effectively prevents reverse airflow and improves system efficiency. Capable of handling airflow speeds up to 8 m/s, the VK 40/20 ensures reliable air man ...
Helios Fans VK 400
The Helios VK 400 is a flat overpressure shutter designed to enhance ventilation efficiency by preventing reverse airflow when the fan is switched off. It features automatic louvre operation that responds directly to fan activity, opening during operation and closing when the fan stops. Suitable for airflow velocities of up to 8 m/s, this shutter e ...
Helios Fans VK 450
The Helios VK 450 is a flat-design overpressure shutter engineered for efficient ventilation control. It automatically opens when the fan is running and closes upon shutdown, preventing unwanted backflow and maintaining system integrity. Capable of handling airflow velocities up to 8 m/s, the shutter ensures reliable performance under typical venti ...
Helios Fans VK 50/25
The Helios VK 50/25 is a flat-design overpressure shutter that automatically opens when the fan operates and closes when it stops, preventing unwanted airflow reversal. Designed to handle airflow velocities up to 8 m/s, it offers effective backdraft protection for ventilation systems. The number of louvres varies with shutter size, optimizing airfl ...
Helios Fans VK 50/30
The Helios VK 50/30 overpressure shutter features a flat design and automatically opens when the fan is running and closes when it stops, preventing reverse airflow. Suitable for flow velocities up to 8 m/s, it ensures reliable ventilation system protection. The shutter includes a variable number of louvres tailored to the size for optimal airflow ...
Helios Fans VK 500
The Helios VK 500 overpressure shutter features a flat design that automatically opens when the fan is operating and closes when the fan stops, preventing unwanted reverse airflow. It is suitable for use at flow velocities up to 8 m/s. Depending on the size, the number of louvres varies to provide optimal airflow management. This shutter is ideal f ...