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Frequently Asked Questions

  • How does the AOS electrostatic precipitator (ESP) work?

    The AOS ESP unit utilises the principle of electrostatic precipitation. The dirty exhaust air is drawn onto the mesh pre-filter which traps large grease particles. The remaining finer particles some small as 0.01-micron pass into a strong electrical field (ionising section) where the particulate receives an electrical charge. The charged particulate then passes onto a collector plate section made up of a series of parallel plates. Each alternate plate is charged with the same polarity as the particles repel are grounded, which attract and collect.

  • Why is the face velocity important a ESP unit?

    The number one rule for electrostatic precipitators the higher the velocity the lower the efficiency. The faster the exhaust air travels through the ESP unit, efficiency is greatly compromised. The buyer should consider the physical size of the ESP unit, pre-filters, electrostatic cells.

  • How does the UV Ozone work in a AOS ESP unit?

    The UV Ozone lamp is located behind the electrostatic cells. The UV Ozone lamps produce ozone and undergo chemical processes such as photolysis and ozonolysis that breaks down grease and odour containing compounds producing during cooking. The UV ozone component reduces oil and grease build up in kitchen exhaust ductwork and reduces fire risk. When the AOS ESP unit is in operation and the UV ozone is automatically turned on. The 2 in 1 AOS electrostatic precipitator with UV ozone ( B – Model) is available in all RY series units.

  • Who does AOS work with?

    AOS Australia & New Zealand works with ventilation and mechanical contractors, this includes air-conditioning companies, architects, consultants, builders, shopfitters, engineers, local councils to develop smoke and odour solutions for kitchen exhaust systems and as well as the HVAC industry.

  • Have the RY series (B – Model) electrostatics been tested?

    The RY series have been independently tested to ASHRAE standard tested 52.2 2012 provides the first industry accepted procedure for measuring electrostatic filters
    (extracts are reproduced for reference). The AOS electrostatic units have been air quality assessed and smoke and odour sampled was conducted by KMH environmental and certified and tested to AS 1668 parts 1 & 2 and BCA performance requirements FP4.3, FP4.4, FP4.5, F4.0, FP4.12.

  • What is the efficiency of the AOS (B – Model) electrostatic precipitators?

    Single pass efficiency collects up to 95% efficiency and double pass efficiency which exhaust air is passed through two units giving it an efficiency of 99.9% and for modular filtration systems, the AOS ESP units can be stacked on top of each other to increase airflow (L/s) requirements.

  • When is the double pass system required?

    For the heavier cooking applications which produce increasing amounts of smoke and odours or when exhaust air is discharged at street level.

  • Where is the best position to install a AOS ESP unit?

    The AOS ESP unit should be installed as close as possible to the commercial kitchen exhaust hood and this positioning reduces the amount of oil and grease which can accumulate in the ductwork.

  • Can AOS provide assistance on local council approval for your application?

    AOS can provide assistance to help you with local council approval for your filtration requirements.

  • What should the velocity (Air speed) required to travel through the electrostatic precipitator units?

    2/3 m/s is the best airflow velocity and any higher the electrostatic precipitator won’t be efficient enough and efficiency will be greatly compromised.

  • Can the RY series (B – Model) electrostatic precipitator be implemented for a street level discharge?

    Yes, the RY series (B – Model) ESP unit can be used for a street level discharge in accordance with AS 1668 and BCA laws pure and clean exhaust air can be expelled on street level without any nuisance. A double pass system is strongly recommended for a street level discharge.

  • When is the maintenance required on a AOS RY series ( B – Model) electrostatic precipitator required?

    The maintenance varies from business to business. AOS Australia provides maintenance services and schedules to each customer.

  • What are the advantages of the AOS electrostatic precipitators (ESP) unit?

    • The control panel recessed into the ESP unit.
    • Powder coated 1.4mm galvanised steel and the AOS ESP unit is weatherproof and can be installed for outdoor installation and rain cover can be provided to protect the cooling fan.
    • Built in oil tray within the AOS ESP unit.
    • Advanced gasket door system which stops the leaking of grease and oil.
    • Stainless steel rails make it easier for electrostatic cells to slide in and out of the AOS ESP unit.
    • Optional UV Ozone available in all RY series (B – Model) electrostatic precipitator units.
    • All electrostatic cells utilise compression switches no springs are used.
    • Can remove particulate up to 0.01 microns.