Carbon filters

Carbon filters are commonly used to remove gases and odours from the air. Activated Charcoal pellets used in both Carbon V Banks are manufactured from raw material such as coal, coconut shell and wood. The raw material is first processed to produce a char and then put through the activation stage. This involved heating the char between 800-1000°C in an atmosphere of steam, which develops the high surface area and extensive pore network. Through this process numerous types of carbon can be produced that give a range of adsorption capacities, making the carbon more effective as a filter. Carbon filters remove pollutants from the air through the process of adsorption, where pollutants stick to the outside of the carbon. The increase in surface area due to the activation process gives gases a greater area to stick to. When a gaseous molecule comes in contact with the carbon, it will stick to the carbon surface if there is an open adsorption site.

References: Myers, P. D. (2018). Activated Carbon Air Filters: Everything You Need to Know. Retrieved from https://molekule.com/blog/activated-carbon-air-filter/

Ozone generators

Ozone is made up of three oxygen atoms (O3) while Oxygen has two atoms (O2). As Ozone has an extra atom, it can attach itself to other substances since the bonds between the three oxygen atoms are relatively weak. This volatile nature of Ozone makes it highly reactive and can therefore alter the chemical composition of some substances through oxidation. Ozone generators produce Ozone by splitting apart Oxygen molecules (either through Corona discharge or Ultraviolet radiation) to individual atoms, which then combine with other Oxygen molecules to form Ozone. Being highly volatile, Ozone then reacts with a contaminant through oxidation, destroying itself in the process as it reverts back to Oxygen molecules.

  • Carbon Bank:
  • Duct Mounted UV Ozone Lamps:
  • UV Ozone Chamber:
  • Self-contained Ozone Generators:

The RydAiR Activated Carbon V Bank, CB2500/CB5000 can be incorporated to the RydAiR Electrostatic Air Cleaners units for the control of cooking odour. The exhaust fan pulls the air containing cooking fumes into the EAC through the kitchen hood and ducts. Once the wet and dry contaminants such as dust, oil mist and smoke are filtered in the EAC, the filtered air passes through the Carbon Bank where odour is removed. Clean and odourless air is finally discharged to the exterior of the building via the exhaust ducts.

RydAiR’s Carbon banks consists of many trays of Activated Carbon Pellets. Each pellet measures approximately 5mm x 3mm with thousands of tiny pores which adsorb odour molecules as air passes through. The effectiveness of the Carbon Bank depends on the amount of carbon pellets use. For severe odour problems, up to 40 kg of carbon pellets may be required for each 3600 CMH of air to be treated.

UVi-Aire’s DUO Series UV Ozone Lamps are mounted at a central location along the main kitchen exhaust duct to allow for maximum contact time between kitchen odour and Ozone. For optimum performance, contact time for air treatment in the duct should be approximately 0.1 to 0.2 seconds or longer if possible.

The exhaust fan pulls the air containing cooking fumes into the kitchen hood and ducts. As the air passes through the ducts and comes into contact with the UV Ozone Lamps, Ozone oxidises the gaseous molecules of the contaminants, removing odours in the process. Purified odourless air is then exhausted out of the building via the connecting ducts. Charcoal filters may be installed at the last stage to mop up residue Ozone.

Caution: Prolonged and excessive exposure to Ozone can cause health problems, therefore Ozone generators should be used in the absence of human exposure. As the DUO units produce an intense UV radiation and large amounts of Ozone, its operations should be interlocked with the exhaust fan for safety. The DUO Interlocking Control Panel is available as an option to control the DUO units from the kitchen exhaust fan system.

UVi-Aire’s UV Ozone Chambers, COS-5-90/COS-10-90, are installed as near to the cooking hoods as possible, to allow for maximum contact time between kitchen odour and Ozone. For optimum performance, contact time for air treatment in the duct should be approximately 0.1 to 0.2 seconds or longer if possible.

The exhaust fan pulls the air containing cooking fumes into the kitchen hood and ducts. As the air passes through the ducts and comes into contact with the UV Ozone Chamber, Ozone oxidises the gaseous molecules of the contaminants, removing odours in the process. Purified odourless air is then exhausted out of the building via the connecting ducts. Charcoal filters may be installed at the last stage to mop up residue Ozone.

Caution: Prolonged and excessive exposure to Ozone can cause health problems, therefore Ozone generators should be used in the absence of human exposure. As the COS units produce an intense UV radiation and large amounts of Ozone, its operations should be interlocked with the exhaust fan for safety. The DUO Interlocking Control Panel is available as an option to control the COS units from the kitchen exhaust fan system.

Uvi-Aire’s FG-C units are Ozone generators that produce high volumes of Ozone via the Corona Discharge method. The self-contained units come with a 100m diameter nozzle on one end to direct Ozone to the required area by means of flexible or rigid ducts. As the units are compact sized, flexible installation in various locations is possible.

Air is drawn through a blower fan into the corona plates, powered by high tension transformers. The oxygen laden air is then converted to Ozone which is discharged through the nozzle into the desired area of the exhaust duct where the Ozone reacts with the contaminants. FG-units can be used in kitchen exhausts, garbage rooms, sewage treatment rooms, seafood storage areas, fresh food storage and other areas with odour problems.

Caution: Prolonged and excessive exposure to Ozone can cause health problems, therefore Ozone generators should be used in the absence of human exposure. As the FG unit produce high levels of Ozone, its operations should be interlocked with the exhaust fan for safety. Interlocking components such as an Interlocking Control Unit and an Air Flow Activated Switch are available as optional items.