Vents - TT 125 Un Mixed-Flow Inline Fan Ø125 mm with Controller and Sensor

125 mm inline fan with a mixed-flow impeller, built-in speed controller and temperature sensor. Moves up to 280 m³ per hour at 37 dB(A) at three metres and weighs 1.79 kg.

The TT 125 Un is the middle size of Vents' standard TT series. The difference with the regular TT 125 is the control: this fan adjusts itself to the temperature.

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 full power. 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.

Mind the thermal protection. Vents states for the TT 100 and TT 125 that the thermal switch cannot be reset: once it trips, the fan has to be replaced. Keep resistance low (clean filter, short ducts) and don't extract air warmer than 40 °C.

Construction and maintenance

The housing is plastic, the motor runs on ball bearings and the fan is IPX4, so splash-proof. It can be mounted in any position. The motor section with impeller comes out of the housing without disconnecting the ducts. Clean the impeller at every crop change: dust costs airflow and causes imbalance.

Technical Specifications:

• Power consumption: 23 W to 37 W
• Current: 0.18 A to 0.27 A
• Connection size: 125 mm
• Airflow: 220 to 280 m³ per hour
• Noise level: 28 to 37 dB(A), measured at three metres
• Control: built-in speed controller with electronic thermostat
• Temperature sensor: external, on a 4 m cable
• Plug: cable with plug included
• Bearings: ball bearings
• Protection rating: IPX4
• Air temperature: up to 40 °C
• Weight: 1.79 kg
• Mounting: any position

Frequently asked questions

What is the difference with the TT 125 RV?
The RV only has a switch for low and high. The Un controls steplessly and switches by temperature itself. Motor, airflow and housing are the same.

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 fan's airflow or under a lamp.