Vents - VK 250 EC Un Centrifugal Inline Fan Ø250 mm, 1250 m³/h

250 mm centrifugal inline fan with EC motor, built-in speed controller and temperature sensor. Moves up to 1250 m³ per hour at 48 dB(A) at three metres, with a maximum power consumption of 165 W.

The VK 250 EC Un combines the pressure of the centrifugal VK series with an EC motor and its own temperature control.

Why EC

An EC motor is electronically commutated. It is more efficient than a regular AC motor, especially at lower speeds, and can be controlled steplessly and quietly without the hum you sometimes hear with a regular controller. If your fan runs day and night, that adds up to a real saving over a year.

Why centrifugal

The impeller with backward-curved blades builds more pressure than an axial or mixed-flow impeller of the same size. With a carbon filter, a long duct or a few bends in the system, the VK holds its airflow better.

Controller with temperature sensor

The Un version has a speed controller with an electronic thermostat built into the housing and a separate temperature sensor on a 4 metre cable. Place the sensor where it matters, for example at the top of the grow room. Use the knobs on the fan to set the base speed and the target temperature. When it gets warmer than set, the fan switches to maximum speed. When the temperature drops again, it returns to the set speed. So you don't need a separate controller or thermostat.

The fan comes with cable and plug: connect it, hang the sensor and set it up.

Construction

The housing is plastic, the motor is IP55 and the fan as a whole IPX4. It can be mounted in any position and moves air up to 60 °C. Use the mounting feet to fix it to a wall, ceiling or beam.

Technical Specifications:

• Power consumption: up to 165 W
• Current: up to 1.1 A
• Connection size: 250 mm
• Airflow: up to 1250 m³ per hour, stepless
• Noise level: 48 dB(A) at maximum speed, measured at three metres
• Motor: EC motor, IP55
• Impeller: centrifugal, backward-curved blades
• Control: built-in speed controller with electronic thermostat
• Temperature sensor: external, on a 4 m cable
• Plug: cable with plug included
• Protection rating: IPX4
• Air temperature: up to 60 °C
• Weight: 4.3 kg
• Mounting: any position

Frequently asked questions

What is the difference with the VK 250 U?
The VK 250 U has a regular AC motor and moves 1080 m³ per hour. The EC version moves 1250 m³ per hour and is more efficient at low speed.

Where do I hang the sensor?
Where you want to monitor the temperature, usually at the top of the room where heat builds up. Not directly in the airflow or under a lamp.