UV System in Hospital and Healthcare

UVGI AHU systems install UV-C lamps (254 nm, low-pressure or amalgam) in the air handling unit (AHU) downstream of the filters and upstream of the supply air duct. As supply air passes through the UV irradiation zone at 0.5–2 m/sec face velocity, each air molecule and any airborne particle receives a UV dose of 15–40 mJ/cm² — sufficient for 3-log inactivation of Mycobacterium tuberculosis (the most UV-resistant common airborne pathogen), MRSA, VRE, and all respiratory viruses including SARS-CoV-2. The OZ India UVGI AHU system is designed for the specific AHU dimensions and air velocity at each hospital AHU installation.

UV Tower Mobile 360 Disinfection provides whole-room UV-C surface and air disinfection after housekeeping has manually cleaned a patient room or OT. The mobile tower is positioned in the centre of the room and emits UV-C radiation in all directions simultaneously from multiple UV lamps totalling 150–400W output. At 15–25 minutes exposure at 2-metre distance, UV dose on all room surfaces exceeds 40 mJ/cm² — achieving 4-log MRSA surface kill validated by AOAC Use-Dilution test methodology. The room is unoccupied during the UV treatment cycle; personnel exit and the tower activates via timed remote control.

Ozone for hospital room terminal disinfection uses the OZ India Ozone Air Purifier (2–5g/hr) in an automated cycle: 30–60 minutes at 1–3 ppm ozone in the room atmosphere, followed by 30-minute ventilation. At these concentrations, ozone achieves 3-log reduction of airborne and surface bacteria, including C. difficile spores that are resistant to many chemical disinfectants. Ozone penetrates HVAC ducts, mattress seams, and fixture crevices that UV cannot reach due to shadowing — making ozone a complementary technology to UV for whole-room disinfection.

UV water disinfection in hospitals provides safe water for critical applications: OT scrub water, ICU handwashing, dialysis water make-up, and pharmaceutical water for compounding pharmacies. OZ India UV systems at 40 mJ/cm² serve flows from 100 LPH (single sink) to 5,000 LPH (central water treatment), with bacteriostatic flow restrictors preventing recontamination downstream. For hospitals with dialysis units, a dedicated UV system for dialysis water make-up (flow 10,000–50,000 LPH) ensures pyrogenic-free water meeting AAMI standards for dialysate quality.

Ozone sterilisation chambers provide a chemical-free alternative to formaldehyde or ethylene oxide sterilisation for heat-sensitive medical instruments and equipment (plastic components, endoscope accessories, electronic sensors). OZ India ozone sterilisation chambers use ozone at 3–6% concentration in a sealed chamber at 25–30°C and 95% RH for 30–60 minutes — achieving the SAL (Sterility Assurance Level) of 10⁻⁶ required for sterile medical device certification. The process is validated per ISO 14937 (ozone sterilisation) and produces no toxic residuals (ozone reverts to oxygen).

Hospital HVAC design with UVGI follows ASHRAE 170-2017 (Ventilation of Healthcare Facilities) and NBC (National Building Code of India) specifications for OT air cleanliness. OZ India UVGI engineers review the hospital's HVAC drawings and size the UV bank for the specific AHU dimensions, air velocity, and required disinfection efficacy. The UVGI installation does not require any modification to existing AHU construction — UV lamp banks are inserted into the existing AHU casing through standard maintenance access points, minimising installation cost and HVAC disruption.

OZ India Technology's hospital infection control solutions include: UVGI AHU systems (custom designed for each AHU size and configuration), UV Tower Mobile 360 Disinfection (suitable for patient rooms, OTs, ICUs, and isolation rooms), UV water disinfection systems (100 LPH to 50,000 LPH), ozone sterilisation chambers, and ozone ambient air monitors for safety compliance. All equipment is CE certified, ISO 9001:2015 manufactured, and supplied with the validation documentation required for NABH accreditation.

NABH accreditation support is a core part of OZ India's hospital project delivery. Our engineers provide: UV dose validation reports (irradiance measurement protocol per IUVA recommendations), AHU UVGI installation IQ/OQ documentation, hospital water quality testing report (pre- and post-UV commissioning), ozone chamber sterilisation validation (biological indicator testing with Geobacillus stearothermophilus spores per ISO 14937), and training certification for hospital infection control nurses. These documents directly address NABH Chapter 3 (Patient Safety) and Chapter 6 (Infrastructure) requirements.

OZ India UV Tower Mobile 360 Disinfection Systems are available for purchase or on monthly lease for hospitals — suitable for hospitals wanting to pilot room UV disinfection before full system investment. The mobile unit requires only electrical connection (230V, 10A) and is designed for operation by non-specialist nursing or housekeeping staff. The timed UV cycle (15 or 25 minutes, selectable) automatically shuts down on door opening (safety interlock) and logs each disinfection cycle to a built-in data logger for NABH infection control audit.

Hospital UVGI AHU projects in India require AERB clearance for installations above certain UV power thresholds and coordination with the hospital's engineering and infection control teams. OZ India provides complete project management: site survey, HVAC drawing review, UVGI design report, equipment supply, installation (by certified electrical engineers), commissioning, UV irradiance measurement validation, and operator training. Our hospital UVGI installations include tertiary care hospitals in Delhi NCR, Pune, and Bengaluru — demonstrating project execution capability in operating hospital environments.

UVGI AHU system sizing requires: AHU air flow (m³/hr), AHU cross-section dimensions (width × height in mm), air velocity at the UV bank (m/sec), and target UV dose (40 mJ/cm² for OT class, 25 mJ/cm² for ICU/ward). OZ India calculates the required UV irradiance: Dose (mJ/cm²) = Irradiance (mW/cm²) × Exposure time (sec). At 1 m/sec air velocity and AHU 600mm × 400mm cross-section: exposure time = 0.3 m (UV bank length) ÷ 1 m/sec = 0.3 sec. Required irradiance for 40 mJ/cm²: 40 ÷ 0.3 = 133 mW/cm². This determines the number of UV lamps required.

UV Tower Mobile 360 sizing: One unit is recommended per 5–8 patient rooms for efficient between-patient room disinfection (15-minute cycle + mobilisation time = 20 minutes per room, 24 rooms per shift). For OTs with 3–4 tables and turnover requirement of 3 cases/day per table, 2 UV towers rotating between OTs provides the required disinfection cycle time between surgical cases. OZ India provides a facility layout analysis to determine the optimal number of UV towers for the hospital's bed capacity and room turnover requirements.

Ozone sterilisation chamber sizing: Chamber volume is determined by the maximum load volume of instruments to be processed per sterilisation cycle. Standard OZ India chambers: 50L (small clinic/day surgery), 150L (medium hospital), 300L (central sterile supply department). Ozone sterilisation of medical instruments requires 30–60 minutes per cycle at 3% O₃ concentration, 95% RH. Processing throughput: 50L chamber handles approximately 3 laparoscope sets per cycle. OZ India sizes the chamber to the hospital's daily instrument load with 20% capacity buffer.