Vents - TT 125 Mixed-Flow Inline Fan Ø125 mm

125 mm inline fan with a mixed-flow impeller and two-speed motor, moving 220 or 280 m³ per hour at 28 to 37 dB(A) at three metres. Weighs 1.79 kg.

The TT 125 is the middle size of Vents' standard TT series, here in the version without a built-in speed switch. There is one property you should know beforehand, because it decides how you install it.

The thermal cut-out cannot be reset

If the motor overheats, the thermal protection switches it off before damage occurs. Many fans cool down and start again afterwards. Vents states in the TT 100 and TT 125 manual that this is not the case here: once the cut-out trips, the fan has to be replaced. Prevention is the whole story.

Keep resistance low. A clogged filter, a long flexible duct with many bends or a restricted intake make the motor work harder than necessary.

Mind the air temperature. According to Vents this model is made for air up to 40 °C. If you regularly extract warmer air, choose a TT 150 or a TT Pro.

Don't size too tight. A fan that has to run on high day and night is permanently at the top of its capacity. One size up on a lower speed runs cooler, quieter and lasts longer.

Without built-in switch

This is the TT 125 without RV. The motor has two speeds, but there is no switch on the fan itself: you control the speed with a separate speed controller. No plug is supplied. If you want to choose low and high on the fan itself, take the TT 125 RV.

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 it at every crop change: dust on the impeller costs airflow and causes imbalance.

Technical Specifications:

• Power consumption: 23 W on low, 37 W on high
• Current: 0.18 A to 0.27 A
• Connection size: 125 mm
• Airflow: 220 m³ per hour on low, 280 on high
• Noise level: 28 to 37 dB(A), measured at three metres
• Motor: two-speed motor with thermal protection
• Speed switch: none, control via a separate controller
• Plug: optional; choose "Plug" above and you get a separate 2 m lead with plug (2 x 0.75 mm²). With it you connect one speed; for low and high you need a separate switch.
• 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 has the speed switch on board and comes with cable and plug. This version has neither switch nor plug. Motor, airflow and housing are the same.

What is the difference with the TT 125 Un?
The Un has a built-in speed controller with thermostat and a separate temperature sensor, so it adjusts its speed to the temperature by itself.