VENTS Inline Fans

Low-pressure axial fan from the Vents VKOM series, with a steel housing and the option for recessed / in-line mounting directly in the ventilation system. The fan has an asynchronous single-phase motor with integrated thermal overheating protection with automatic restart.

• for use in commercial, office and other public or industrial premises
• application: combined (extract and supply) ventilation system for various spaces requiring high airflow with relatively low system resistance
• The fan is powered through the remote terminal box. The power supply and installation must be carried out in accordance with the terminal-box manual and wiring diagram.
• diameter: ⌀ 162 mm
• max. airflow: 180 m³/h

• Suitable for use in commercial, office and other public or industrial premises.
• Application: combined (extract and supply) ventilation system for various spaces requiring high airflow with relatively low system resistance.
• Motor: the single-phase asynchronous motor is equipped with thermal overheating protection with automatic restart. The motor is equipped with sleeve bearings. Degree of protection of the motor IP44.
• Speed control: step speed control via an external autotransformer (sold separately).
• Mounting: can be wall-mounted or recessed (in-line); (mounting brackets included).
• Power supply: the fan is powered through the remote terminal box. The power supply and installation must be carried out in accordance with the terminal-box manual and wiring diagram.

Technical specifications:

• phases: 1
• voltage: 230 V
• frequency: 50 Hz
• power: 26 W
• current: 0.19 A
• max. airflow: 180 m³/h
• speed: 1432 rpm
• noise level at a distance of 3 m: 33 dBA
• min. temperature of processed air: - 30°C
• max. temperature of processed air: + 40°C
• degree of protection: resistant to dust and water splashes (IPX4, IP44)
• blade material: aluminium
• housing material: steel

Fan dimensions (as shown in photo no. 3):

• B: 183 mm
• diameter D: ⌀ 162 mm
• length L: 220 mm
• L1: 40 mm
• L3: 30 mm
• weight: 1.8 kg

VENTS RSA5E-4-M is a professional 5-step transformer speed controller designed to control single-phase AC fans with a maximum rated current of up to 4 A. The speed is selected using a mechanical rotary switch, while autotransformer control ensures stable and reliable motor operation. The model has built-in motor-overheating protection and can be connected to a thermostat and air-damper actuator.

VENTS RSA5E-4-M is designed to regulate the airflow of compatible single-phase fans by changing the motor speed. Unlike conventional electronic controllers, the model uses a transformer control principle and offers five predefined operating steps.

The desired speed is set using a mechanical rotary switch on the front panel. This makes control easy and allows the airflow to be adapted to the specific needs of the ventilation system – for example, a lower speed under normal conditions and a higher speed when intensive air exchange is needed.

One of the important advantages of the RSA5E-4-M is its integrated motor protection. The controller can operate with the thermal contacts of a compatible fan. If the motor's thermal relay is triggered because of overheating, power to the fan is interrupted. Once conditions return to normal, the power supply is restored automatically.

It also has additional terminals for connecting an external thermostat or air-damper motor, allowing the controller to be integrated into more complex climate-control and ventilation installations.

The RSA5E-4-M has a metal casing and is designed for surface wall mounting. Its protection rating is IP21, and the permitted ambient operating temperature is from +5°C to +40°C.

Technical specifications

✔️ Manufacturer: VENTS
✔️ Model: RSA5E-4-M
✔️ Type: Transformer speed controller
✔️ Control: Stepped
✔️ Number of speeds: 5
✔️ Phases: 1
✔️ Supply voltage: 230 V / 50 Hz
✔️ Rated motor voltage: 230 V / 50 Hz
✔️ Maximum rated load: 4.0 A
✔️ Fuse: 5.0 A
✔️ Protection rating: IP21
✔️ Operating temperature: +5°C to +40°C
✔️ Casing: Metal
✔️ Mounting: Surface wall mounting
✔️ Dimensions: 241 × 184 × 132 mm
✔️ Weight: 4.5 kg
✔️ Terminals: screw type, 0.5–2.5 mm².

🛡️ Functions and protections

RSA5E-4-M offers more than ordinary speed control:

✔️ 5-step adjustment of the fan speed
✔️ Mechanical rotary switch
✔️ Integrated motor overheat protection
✔️ Automatic power restoration after the temperature returns to normal
✔️ Option to connect a thermostat
✔️ Option to control an air-damper actuator.

🔧 Applications

VENTS RSA5E-4-M is suitable for controlling compatible single-phase fans in:

• Greenhouses
• Nurseries
• Warehouses
• Production facilities
• Workshops
• Technical rooms
• Supply ventilation systems
• Extract ventilation systems
• Other professional systems where stepped air-flow control is required.

🔌 Operating principle

When a different position is selected on the rotary switch, the controller supplies a different voltage to the fan motor. In this way, the speed and therefore the air flow change in five distinct stages.

This type of control is particularly suitable for compatible AC motors when reliable adjustment is required without the need for complex electronics.

📋 Installation and use

1. Mount the controller vertically on a stable wall.
2. Connect the power supply and fan to the corresponding terminals according to the VENTS wiring diagram.
3. If the motor has suitable thermal contacts, connect them to the controller's protection circuit.
4. If necessary, connect an external thermostat or air-damper actuator.
5. After checking the electrical installation, switch on the power supply.
6. Select the required speed using the rotary switch.

⚠️ Important: The maximum rated load of the RSA5E-4-M is 4.0 A. Before connection, the fan motor's rated current and its compatibility with transformer control must be checked. Electrical connection should be carried out according to the manufacturer's diagram and requirements.

💡 Tip from Urban Botaniks: A transformer controller is a good choice for ventilation systems where the fan does not need to run constantly at maximum speed. Selecting a suitable lower stage can reduce air flow and noise, while maximum speed remains available for periods when more intensive air exchange is needed.

VENTS VKF 4E 450 is a professional axial duct fan for systems that require high airflow at relatively low resistance. The model is designed for direct installation in an air duct and provides a maximum airflow of up to 4680 m³/h at a power rating of 250 W. Its robust steel housing with polymer coating, single-phase AC motor with ball bearings and integrated thermal protection make it suitable for greenhouses, warehouses, production premises and other professional ventilation installations.

VENTS VKF 4E 450 is part of the industrial series of axial fans VENTS OV / OVK / VKF. The main difference of the VKF is its construction designed for direct installation in a ventilation duct, allowing it to be easily integrated into supply and extract ventilation systems.

The fan is suitable for applications where it is necessary to move a large volume of air at relatively low system resistance. At a 50 Hz power supply, the model reaches a maximum airflow of 4680 m³/h, while the motor operates at approximately 1350 rpm and consumes 250 W.

The construction has been developed with an emphasis on reliability during continuous operation. The housing and impeller are made of steel with a durable polymer coating, providing mechanical strength and additional protection for the metal surfaces.

The 4E model uses a four-pole single-phase asynchronous AC motor with an external rotor. The motor has integrated thermal-overload protection, and the ball bearings are designed for a long service life. For this series, the manufacturer specifies a bearing design life of at least 40 000 operating hours.

Another important advantage is the possibility of speed control. When using a suitable thyristor or autotransformer controller, the speed can be controlled smoothly or in steps. This makes it possible to adapt the airflow to the actual requirements of the room.

The operating temperature range at 50 Hz is from -30°C to +60°C, allowing the fan to be used in a variety of conditions. The VKF series has a stated protection rating of IPX4.

Technical specifications

✔️ Manufacturer: VENTS
✔️ Series: VKF
✔️ Model: VKF 4E 450
✔️ Type: Axial duct fan
✔️ Installation: In a duct
✔️ Motor type: AC, asynchronous with external rotor
✔️ Number of poles: 4
✔️ Phases: 1
✔️ Power supply: 220–240 V
✔️ Frequency: 50/60 Hz
✔️ Power at 50 Hz: 250 W
✔️ Current consumption at 50 Hz: 1.2 A
✔️ Maximum air flow at 50 Hz: 4680 m³/h
✔️ Speed at 50 Hz: 1350 rpm
✔️ Noise level at 3 m: 56 dB(A)
✔️ Operating temperature at 50 Hz: -30 to +60°C
✔️ VKF protection rating: IPX4
✔️ Bearings: Ball bearings
✔️ Design bearing life: minimum 40 000 hours.

When operating at 60 Hz

✔️ Power: 325 W
✔️ Current: 1.46 A
✔️ Maximum airflow: 4790 m³/h
✔️ Speed: 1600 rpm
✔️ Noise level at 3 m: 57 dB(A)
✔️ Transported-air temperature: -30 to +50°C.

📐 Dimensions and weight

For VKF 4E 450, the official manual states:

📦 The kit includes

✔️ 1 × VENTS VKF 4E 450 axial fan

✔️ Factory-fitted motor and impeller

✔️ Terminal box for electrical connection

The speed controller and the remaining duct-system components are used separately according to the specific installation.

Benefits

✔️ High airflow – up to 4680 m³/h

✔️ Direct installation in a ventilation duct

✔️ Robust steel construction

✔️ Protective polymer coating

✔️ Single-phase AC motor with external rotor

✔️ Built-in thermal overheating protection

✔️ Ball bearings for long-term operation

✔️ Speed-control capability

✔️ Operating range up to +60°C at 50 Hz

✔️ Suitable for professional supply and extract systems.

🔧 Applications

VENTS VKF 4E 450 is suitable for:

• Greenhouses
• Nurseries
• Storage areas
• Production areas
• Workshops
• Technical rooms
• Commercial and industrial facilities
• Supply ventilation
• Extract ventilation
• Ventilation systems requiring high airflow.

📋 Installation and use

1. Choose a suitable location in the ventilation system.
2. Install the fan securely in the relevant duct.
3. Match the airflow direction to the marking on the housing.
4. Make the electrical connection according to the diagram and the official VENTS manual.
5. If necessary, add a compatible speed controller.
6. After installation, check for vibration, unusual noise and correct airflow direction.
7. Carry out periodic maintenance and clean the impeller.

⚠️ Important: VKF 4E 450 is an high-flow axial fan, intended mainly for systems with relatively low aerodynamic resistance. In systems with a high pressure drop, multiple bends, long ducts or highly restrictive filters, it is important that the fan be sized according to the actual operating point, rather than only according to the maximum free airflow.

💡 Tip from Urban Botaniks: When designing greenhouse or professional ventilation, do not choose the fan solely by the 4680 m³/h rating. Take into account the diameter and length of the ducts, the number of bends, grilles and other resistance in the system to obtain the necessary actual

VENTS RT-10 is a compact mechanical room thermostat for automatic control of fans, heating and air-conditioning systems according to room temperature. It allows the desired temperature to be set in the range +10°C to +30°C and, depending on the connection method, can switch equipment on or off when the set temperature threshold is reached. It operates at 220–240 V / 50–60 Hz, has IP40 protection and is intended for indoor wall mounting.

VENTS RT-10 is an easy and reliable solution for automating temperature control in rooms where ventilation, heating or air-conditioning systems operate. Instead of switching the fan or other equipment on and off manually, the RT-10 monitors room temperature and controls the electrical load according to a preset temperature threshold.

The desired temperature is set using the rotary control on the front panel, with an operating range of +10°C to +30°C. The thermostat can operate with different logic depending on the electrical connection – the contacts can open or close as the temperature rises or falls. This allows the RT-10 to be used both for controlling ventilation/cooling and in applications where heating control is required.

For example, when used with a fan, the controller can be configured so that the fan starts when the set temperature is reached and runs until the temperature falls below the specified threshold. In another configuration, the fan can run until a preset temperature is reached.

The RT-10 has a relatively small hysteresis of about 0.5–1°C, allowing the temperature to be maintained within a narrow range around the selected value without excessively frequent switching of the connected equipment.

The housing is made of plastic, allowing discreet wall mounting. The manufacturer recommends installing the thermostat at approximately 1.5 m above the floor, away from windows, doors, heating appliances and other sources that may affect actual temperature measurement.

Technical specifications

✔️ Manufacturer: VENTS
✔️ Model: RT-10
✔️ Type: Room temperature controller / thermostat
✔️ Temperature range: +10°C to +30°C
✔️ Hysteresis: 0.5–1°C
✔️ Power supply: 220–240 V AC
✔️ Frequency: 50/60 Hz
✔️ Maximum ambient temperature: +40°C
✔️ Protection rating: IP40 (on the front-panel side)
✔️ Electrical protection class: Class II
✔️ Housing material: Plastic
✔️ Dimensions: 84 × 84 × 35 mm
✔️ Weight: up to 0.13 kg
✔️ Mounting: Vertical indoor wall mounting.

⚡ Maximum permissible load

The maximum load depends on the connection configuration used.

For the configuration with higher permissible load:

✔️ Resistive load: up to 10 A
✔️ Inductive load: up to 3 A

For the alternative configuration:

✔️ Resistive load: up to 6 A
✔️ Inductive load: up to 2 A.

When connecting a fan, the permissible inductive load must be considered, not only the maximum value for resistive load.

🔄 Control modes

Depending on the selected electrical wiring diagram, VENTS RT-10 allows different operating logic:

✔️ Switching on when the temperature rises – suitable, for example, for a fan that needs to start when the room becomes too warm.

✔️ Switching off when the set temperature is reached – suitable for applications in which the system must operate until the desired temperature threshold is reached.

✔️ Using the thermostat as a standard temperature-controlled electrical socket.

This flexibility makes the RT-10 suitable not only for standard domestic ventilation, but also for a variety of professional climate-control applications.

📦 The kit includes

According to the manufacturer's manual:

✔️ 1 × VENTS RT-10 thermostat

✔️ Product documentation / passport

✔️ Installation screws and fasteners

✔️ Packaging.

🔧 Applications

VENTS RT-10 can be used for automatic control of:

• Duct fans
• Extract ventilation
• Supply ventilation
• Heating systems
• Air-conditioning systems
• Greenhouses
• Plant nurseries
• Storage rooms
• Workshops
• Technical rooms
• Other spaces requiring automatic temperature control.

📋 Installation and use

1. Choose a suitable location for installation on the wall.
2. The recommended height is approximately 1.5 m above the floor.
3. Do not place the RT-10 directly next to windows, doors, heating appliances or other heat sources.
4. Connect the thermostat according to the appropriate diagram for the desired operating logic.
5. Set the desired temperature using the rotary control.
6. After switching on, the system will automatically control the connected equipment according to the room temperature.

⚠️ Important: The RT-10 operates on 220–240 V mains voltage. Installation and electrical connection must be carried out with the power supply switched off and by a qualified person, according to the manufacturer's electrical diagram. The thermostat is intended for indoor installation and must not be exposed to water, precipitation or direct water splashes.

💡 Advice from Urban Botaniks: When controlling ventilation, place the RT-10 where it reflects the actual average temperature of the room. Avoid direct airflow from a fan or air conditioner, as well as immediate proximity to lighting and heating units – otherwise the thermostat may respond to the local temperature rather than the actual conditions in the room.