Integrated Air Disinfection for Healthcare Environments

Hospital Environmental Monitoring: The First Affiliated Hospital of Xi’an Jiaotong University

Monitoring date: 11 October 2022

Areas: Intensive Care Unit ward (North Section), isolation ward and treatment room

Sampling: 11 airborne sampling points; sedimentation method, 15 minutes

Culture conditions: nutrient agar, 35°C for 48 hours

Reported result: 0 CFU at all 11 sampling points

The source page states that this was an independently issued hospital environmental hygiene monitoring result. No pre-treatment comparison value was provided, so a percentage reduction or kill rate should not be inferred from this monitoring record.

The challenge is not only whether disinfection takes place, but how it fits into ongoing clinical activity.

Continuous occupancy and movement

Patient rooms, intensive care units and outpatient areas may remain occupied throughout the day. Some conventional methods, such as exposed UV lamps or chemical spraying, are generally used intermittently and may require the area to be cleared.

Microbial control requirements

Healthcare environments may require particular attention to organisms such as Acinetobacter baumannii, Pseudomonas aeruginosa and MRSA. Isolation rooms and intensive care units are examples of areas where environmental monitoring is important.

Frequently touched surfaces

Air treatment alone does not address every potential transmission route. Bedside tables, equipment panels, door handles and other high-touch surfaces also require appropriate cleaning and infection-prevention procedures.

How OH500F08 Is Designed to Help

The unit releases hydroxyl radicals (·OH) into the indoor environment, where they are distributed by airflow and can interact with airborne substances and exposed surfaces. According to the product information, it is designed for continuous operation in occupied environments. The UV source is enclosed within the unit.

Indoor air is drawn into the reaction chamber by a fan. Under specific UV irradiation conditions, the system generates hydroxyl radicals, which are carried back into the room through the outlet airflow. The intended process is active oxidation and decomposition rather than relying solely on passive capture by a filter.

Reaction pathway shown on the Chinese source page: O₃ + UV → O₂ + O; O + H₂O → 2·OH.

The source page describes the reaction end products as water, oxygen and trace inorganic salts. Actual performance depends on operating conditions and the target substance; consult the relevant test report for the test object, method and conditions.

How It Differs from Common Methods

Compared with exposed UV lamps: The unit is designed to operate without clearing the room; the UV source is enclosed inside the equipment.

Compared with chemical spraying: The system does not rely on spraying a chemical disinfectant into the room. Product information describes no chemical-agent residue from the hydroxyl reaction process.

Compared with filtration alone: Filtration captures particles that pass through the filter. OH500F08 is designed to release reactive species into the room and support treatment of both air and exposed surfaces.

Important: The results below come from different tests and test subjects. Whole-unit air tests, hydroxyl-lamp-module surface-carrier tests and prototype-module tests are separate evidence categories. Their results must not be directly compared or represented as equivalent. Test conditions and full reports should accompany technical claims where required.

A. Whole-unit air testing for OH500F08

Testing organization: Guangdong Microbiology Analysis and Testing Center. Report No.: 2022FM10597R01.

B. Surface-carrier tests on a hydroxyl lamp module (not the complete OH500F08 unit)

Report project: CETEC Pty Ltd, Australia, project V2007069. Testing performed by Analytical MicroLabs, Geelong, Victoria. Methods listed on the source page: ASTM E2197-17 and E1053-11.

The source page reports an initial concentration of 10¹² organisms/mL for the bacterial tests and initial concentrations of 10⁶ and 10⁵ virions/mL for the HSV-1 test. These are module-level laboratory results on non-living, non-porous metal carriers, not whole-unit clinical performance results.

C. SARS-CoV-2 test on a prototype hydroxyl module (not the complete OH500F08 unit)

The source page cites a public report from the Doherty Institute for Infection and Immunity, a joint institute of the University of Melbourne and Royal Melbourne Hospital. In the reported test, virus-containing droplets were placed in a dish inside the device and compared with an unexposed control after 90 minutes; the source states that significant inactivation was observed from 30 minutes. The reported 99.2% result applies to this specific in-device sample test and should not be presented as an in-room or whole-unit result.

D. Additional manufacturer-reported air tests — reports available on request

Manufacturer-reported air-test results: H1N1 influenza A virus: 99.37%. Human coronavirus HCoV-229E: 99.99%. OH-FEEL® confirms that the corresponding test reports are available on request. Consult those reports for the tested configuration, method, exposure time and other conditions. These figures are not a general room-disinfection guarantee or evidence of reduced clinical infections.

Specifications supplied by the manufacturer for OH-FEEL® OH500F08. Consult the current product instructions for installation and operation.

ICU / Intensive Care: Consider bed-unit placement and continuous operation, subject to room assessment and local infection-control requirements.

Isolation rooms: Consider one unit per room where appropriate; use alongside required negative-pressure and ventilation systems, not as a replacement.

Operating rooms / interventional rooms: Deployment and operation should be assessed against the facility’s operating-room protocols and engineering requirements.

Fever clinics / emergency departments: Consider waiting areas and consultation rooms with frequent occupant turnover.

Hemodialysis units: Consider multiple points in treatment areas where patients may stay for extended periods.

Pharmacy compounding / laboratories: Assess suitability for designated clean areas and sample-handling environments.

Pediatrics / respiratory departments: Consider patient rooms and waiting areas, subject to site-specific requirements.

Central sterile supply departments: Consider designated storage areas for sterile supplies where appropriate.

Dental treatment areas: Assess placement according to room volume, airflow, treatment workflow and local requirements.

Placement: Place the unit on the floor near a wall and avoid directing the outlet straight at people who remain in one position for long periods. The stated applicable enclosed-space volume is no more than 40 m³ per unit; additional units may be needed for larger spaces.

Operating schedule: The source page recommends continuous operation and also lists a 1–12-hour timer. Follow the product instructions and the healthcare facility’s own operating procedures.

Occupied-environment use: The product is described as designed for operation while people remain in the room. The UV source is enclosed within the unit.

Inlet and outlet filters: Clean regularly. Washable filters should be completely dried before reinstalling.

High-efficiency filter: The source page recommends cleaning every 3 months and replacement every 6–12 months, adjusted for dust conditions.

UV lamp: Replace after 14,000 operating hours, following the unit’s replacement prompt and instructions.

Compliance note: OH500F08 is described on the source page as a disinfection product, not a medical device. China filing and certification information does not by itself establish authorization for sale or use in every overseas market. Confirm local regulatory, electrical-safety and healthcare-facility requirements before market entry or installation.