Carrier shares independent test results for OptiClean


Independent tests have been carried out on Carrier’s OptiClean air scrubber and negative air machine, which the company said show the solution rapidly reduces concentrations of ultra-fine, virus-sized particles in the air.

The company shared that the research, carried out by the UK Building Research Establishment (BRE), demonstrated that OptiClean cuts levels of airborne particulates in the critical size range (up to 1μm diameter), which encompasses viruses and virus-containing aerosolised droplets, by around two thirds within 30 minutes. Moreover, the company reported that the results show OptiClean is as effective when located in the corner of a room as at the centre.

An OptiClean unit during tests at BRE’s UK headquarters

An OptiClean unit during tests at BRE’s UK headquarters

“These independent findings demonstrate that OptiClean effectively targets ultrafine virus-sized airborne particles and can be installed in buildings as part of a risk reduction and mitigation strategy,” said Matthew Maleki, product manager responsible for indoor air quality (IAQ) and healthy buildings solutions, Carrier UK. “International air quality standards, embodied in WHO, EU and UK regulations, specify limits for particles in the size range PM2.5 to PM10. The tests show OptiClean is effective at significantly reducing concentrations of even smaller particles, in the ultrafine <PM1 range.”

The BRE tests were conducted in a sealed room into which high levels of ultrafine airborne particulates were introduced. Particle sizes were carefully controlled to mimic virus-sized particles and ultra-fine aerosolised droplets. Within 30 minutes of being activated, OptiClean reduced the concentration of these particles in the air by a factor of three, maintaining the reduction for extended periods, Carrier noted.

OptiClean is part of Carrier’s Healthy Buildings Programme, a suite of solutions designed to help deliver healthy, safe, efficient and productive indoor environments across key verticals, including commercial buildings, healthcare, hospitality, education, retail and industry. The unit is also available in a CIAT-branded version called CleanLine.

How OptiClean generates negative pressure in a room

How OptiClean generates negative pressure in a room

In the USA, OptiClean was named one of Time’s 100 Best Inventions of 2020, and in the UK was selected as Air Conditioning Innovation of the Year in the Cooling Industry Awards.

OptiClean can be operated in two modes. Carrier said it can be used as a standalone air scrubber to reduce risks of exposure to airborne pathogens, such as viruses and aerosolised droplets, as demonstrated in the BRE research. It can also be used as a negative-pressure machine to generate a vacuum effect in a room to limit the escape of contaminated air into adjoining spaces, Carrier explained. In this mode, air in the room is drawn through the machine, filtered, and expelled outside the building using flexible ducting.

OptiClean has two stages of filtration. The M5 pre-filter primarily provides protection for the unit from coarse airborne particles, to prevent the main H13/14 HEPA filter from clogging. The company added that H13/14 HEPA filter complies with European Standard EN-1822 and operates with an efficiency rating of up to 99.995% at the most penetrating particle size.

Three model sizes deliver airflow rates between 1,000m³ (35,315ft³) and 2,500m³ (88,287ft³) per hour with a noise level as low as 51dB(A) for use in sensitive areas such as hospitals, offices, school classrooms, libraries and hotels.

TCUK’s David Dunn with an OptiClean unit in position in Sale Shark’s changing rooms

TCUK’s David Dunn with an OptiClean unit in position in Sale Shark’s changing rooms

The European version of OptiClean can be specified with internal UV-C lamps to target pathogens on surfaces within the unit, and activated charcoal filters designed to reduce odours and absorb Volatile Organic Compounds (VOCs).

The unit has castors enabling it to be moved rapidly to areas requiring treatment.

“With the average person spending 90% of their time indoors, a healthier future starts with healthier buildings.,” said Maleki. “Good air quality is as important as safe drinking water. With the effectiveness of OptiClean demonstrated in this independent research, Carrier is leading the way in helping customers confidently approach building environments with a focus on what matters most – the people inside. With people now returning to offices and places of work, OptiClean offers employers and building managers a practical and visible means of reassuring people and supporting healthy buildings.”

Carrier UK has deployed the air cleaner at its offices in Leatherhead and Stockport to help protect staff and support its own healthy buildings policy. Premiership rugby side Sale Sharks also recently took delivery of an OptiClean unit for installation in its changing rooms.

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About Author


Izzy became editor of Auditoria magazine in 2018, having previously served as assistant editor on the title earlier in her career. She is also the editor of Business Jet Interiors International, Railway Interiors International and new launch Cruise Liner Interiors International. Over the course of a decade as a business-to-business magazine editor, Izzy has covered everything from airline catering to car safety technologies, autonomous vehicles and business aviation airports. Outside of work, Izzy loves watercolour painting, live music and travel.

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