The RE four-sided centrifugal fans are low pressure fans that are designed for direct mounting in square HVAC ducts. The RE four-sided duct fans are equipped with EC motors and a radial impeller with backward curved blades. The casing and connecting flanges are made of galvanized sheet metal, the impeller blades are made of plastic. The RE fans have a hinged impeller panel for ease of cleaning or inspection. The fans meet the requirements of the ErP 2015directive.

The RP four-sided centrifugal fans RP / RPH are designed for indoor use. The four-sided centrifugal fans have a housing made of galvanized sheet steel and the RPH fan housing is also equipped with noise insulation. The RP / RPH centrifugal fans have an impeller with forward-curved blades, which is also made of galvanized sheet steel. The operating temperature of the transported air can be -30 to +40 °C.

The RO centrifugal square fans are low-pressure fans, which are designed for direct mounting in square HVAC ducts. The RO square duct fans are equipped with a radial impeller with backward curved blades. The housing and connecting flanges are made of galvanized sheet metal. The impeller blades are made of plastic. The RO fans have a tilting impeller panel for easier cleaning or inspection.

The KT centrifugal fans are designed for direct connection to four-sided ducts. The KT fans are single inlet radial fans with forward-curved blades and an external rotor motor. For easier service and maintenance, the fans are equipped with a tilting impeller. The fan casing is made of galvanized sheet steel. 

The KT centrifugal duct fans can be installed in any position and are adapted for speed control by changing the voltage. The fan speed can be controlled by a 5-stage transformer or a frequency converter with a sine filter. The motors are equipped with built-in thermal contacts connected to the motor terminal block. The contacts must be connected to the corresponding thermal protection relay.

RS / RS EC are centrifugal duct fans designed for direct connection to square ducts. The RS / RS EC single inlet centrifugal fans with backward curved blades are equipped with an external rotor motor and a tilting impeller for easier service and maintenance. The fan casing is made of galvanized steel sheet. The air conveyed must be free of particles that could cause corrosion, motor clogging or impeller imbalance. The fans are not to be exposed directly to the weather. They may be installed in any position and are adapted for speed control by changing the voltage.

RSI / RSI EC are centrifugal duct fans designed for direct connection to square ducts. The RSI / RSI EC single inlet noise insulated centrifugal fans with backward curved blades are equipped with an external rotor motor and a tilting impeller for easier service and maintenance. The fan casing is made of galvanized steel sheet. The air conveyed must be free of particles that could cause corrosion, motor clogging or impeller imbalance. The fans are not to be exposed directly to the weather. They may be installed in any position and are adapted for speed control by changing the voltage.

IRB / IRT are centrifugal fans suitable for general HVAC applications where a low fan height is required. The IRB / IRT centrifugal duct fans are designed for installation in square ductwork. The IRB / IRT fans are equipped with inspection doors for access to the motor and impeller for easy inspection and possible servicing. Due to their higher operating temperature, the fans are suitable for ventilation of warehouses, restaurants, hospitals, sports halls, etc. The IRB fans have a 230V power supply, the IRT fans have a 230/400V power supply. 

Due to their high efficiency and economical operation, the IRB / IRT Ecowatt centrifugal duct fans are suitable for applications where low installation height, quiet operation and high pressure drop are required. The fans are also designed for DCV applications (demand controlled ventilation). The economical IRB/IRT Ecowatt fans are suitable for ventilation of warehouses, hospitals, garages, sports halls, etc.

The ILB / ILT centrifugal fans are designed for installation in four-sided ducts, suitable for general HVAC applications, where their low installation height can be used. Due to the higher operating temperature, the ILB / ILT fans are suitable for ventilation of warehouses, restaurants, hospitals, sports halls, etc. The fans are equipped with an access door. The ILB fans have 230V power supply, the ILT fans have 400V power supply.

The IRAB / IRAT silent centrifugal fans are designed for installation in four-sided ducts. Due to the higher operating temperature of +70 °C, the insulated IRAB / IRAT fans are suitable for ventilation of restaurants, hospitals, sports halls, warehouses, etc. The fans are equipped with a door on the casing for access to the motor and impeller to facilitate cleaning, service and inspection. The IRAB fans have 230V power supply, the IRAT fans have 230/400 V power supply. 

The Elki duct fans are designed for the transport of clean air in residential, office, industrial and public buildings. The Elki fans are unique in their design, which consists of two Etaline fans. The diagonal impeller ensures high efficiency and low fan noise. The fans are equipped with maintenance-free AC motors with protection against humidity, against overheating and with ball bearings. For easier service and maintenance, the fan part can be removed from the housing. The fans can be mounted in any position.

The Emki EC duct fans are designed for the transport of clean air in residential, office, industrial and public buildings. The Emki EC fans are unique in their design, which consists of two Etamaster fans. The diagonal impeller ensures high efficiency and low fan noise. The fans are equipped with maintenance-free, energy-saving EC motors with humidity protection and ball bearings. For easier service and maintenance, the fan part can be removed from the housing. The fans can be mounted in any position.

The KVR / KVR EC centrifugal duct fans are designed for installation in four-sided ducts. They are suitable for air transport in residential, office, industrial and public buildings. The maintenance-free fan motors are equipped with ball bearings.

The KVRI / KVRI EC centrifugal sound-insulated duct fans are designed for installation in four-sided ducts and are suitable for air transport in residential, office, industrial and public buildings. The maintenance-free fan motors are equipped with ball bearings.

The RQ four-sided centrifugal, fully controllable, low pressure fans are suitable for ventilation of simple HVAC applications up to air conditioning. In conjunction with other elements of the Vento system, they guarantee mutual compatibility and parameter balance. The RQ fans are suitable for indoor and outdoor use for transporting air free of mechanical particles. The ambient and operating temperature of transported air is -30 to +40 °C, some types up to 70 °C.