Additions

Essentially, ancillaries are "extras" to assist with the fan mounting and control.

Extras

RHF, a trusted source in the industry, offers comprehensive advice on installation within its IOM. This guidance is designed to ensure the correct and efficient use of ancillary items in fan installation and control.

For example, if a fan needs to be isolated from the ductwork, install anti-vibration mounts and a flexible connections kit at the fan's inlet and outlet. We provide a wide range of ancillary products serving several functions:

Ask us for:

  • Spring & Rubber Anti Vibration Mounts with or without AV Mount Extenders.
  • Flanged and Plain Flexible Connections with and without liners
  • Flat Bar and Spigot Flanges
  • Bolt on and welded in guards
  • Manual slide dampers
  • Channel Bases with or without Outriggers

We also provide a wide range of ancillary products serving several functions:

For assistance with noise

  • Silencers (with transitions) & Motor Mufflers

    The operation of a fan will unavoidably generate noise. Some will be caused by the motor bearings and some will be aerodynamic noise resulting from air flowing through the fan. Careful design and accurate construction the generation of noise can be reduced.

    RHF offers a range of noise reduction solutions that can be tailored to your specific needs. Whether it's around the fan itself or at the inlet and outlet, we can provide the right solution. Our offerings include inlet and outlet attenuators, motor mufflers, and our renowned integral, fully welded flange to flange “lagging" on centrifugal fans. We can even adjust material thicknesses at the click of a button.

    On No.4 and No.7 arrangements, we can look after the motor noise generated by supplying an acoustic hood (motor muffler)

    Remember, as standard on every centrifugal fan quote, RHF provides a full noise data sheet, including motor noise, to arm you and the end users with vital information on their fan installation. For more information on affect at distance, etc., just contact the sales department at RHF Fans.

  • Inverters & Starters

    For both our axial and centrifugal fans, we offer both starters and Inverters to provide you with all the options for starting and control. Why?

    • To vary the speed of the motor to match the required load.
    • To reduce energy consumption by adjusting the fan speed.
    • To improve control, energy efficiency, fan lifespan, and quieter operation.

    As an inverter controls the frequency of the electrical current and therefore consumes less electricity, it is a fantastic addition to our Smoothflow high-energy efficient centrifugal fans. Contact RHF for details.

Air control

  • Dampers

    Manual Slide Damper

    Often referred to as flow restrictors, these dampers, manufactured by RHF Fans, are used to increase system resistance in order to control pressure or volume. Single blade circular dampers are simple, cost-effective, and are ideal for basic system control.

    Opposed Blade Louver Damper

    These dampers are designed to provide efficient airflow control in straight or laminar flow ducts. They are suitable for use at fan outlets or before inlet boxes, offering good isolation. They can be operated manually or electronically.

    Butterfly Damper

    Butterfly dampers are commonly used as shut-off devices. They function as restrictive gates, providing excellent isolation when closed, and can be controlled manually or electronically.

  • Inlet Vane Controls

    These devices create a vortex at the fan inlet, aligning with the fan's rotation in order to reduce the relative rotational speed of the air. This makes the fan act as if it's running slower. When nearly fully open, control is achieved with minimal impact on efficiency. When nearly closed, control shifts to flow restriction. Between these points, a combination of swirl and restriction governs flow.

For monitoring

  • Vibration and Temperature Sensors

    Whilst EVERY fan we manufacture is fully run tested to provide electrical and balance readings to our high standards before leaving the factory, it is often important to keep aware of any changes. In centrifugal fans, imbalance is one of the most common causes of failures.

    • Mechanical sensors are used to take vibration readings, or measure temperature and speed of the motor, bearings and drives. Contact RHF for more information.
    • Technology continues to move forward, and app-based wireless monitoring will increase in circulation.