Case studies

Cleaning of over 100 AHUs to TR19 at the Natural History Museum

8th March, 2017

Air quality is undoubtedly a priority for such a high profile site. As such, Onyx has become the preferred ventilation maintenance supplier at the Natural History Museum. Onyx's responsibilities include deep cleaning and sanitising every one of the 115 AHUs and associated ductwork to TR19 standards. To demonstrate if an AHU or ductwork is not compliant, Onyx conducts a Ventilation Hygiene Risk…

AHU efficiency monitoring and improved filtering at the University of Huddersfield

8th March, 2017

AHU Monitoring and Filter Change Dates: 2014 - 2018 Onyx Facilities Services won the contract to monitor the efficiency of 88 AHUs at Huddersfield University to determine each unit's efficiency and recommend remedial action. Through use of magnahelic gauges and monitoring equipment, our engineers measure each unit's positive, negative and differential pressures. As part of the service, Ony…

Major Overhaul at Watford General Hospital of Ventilation and Inspection and Maintenance of Fire Dampers

1st March, 2017

The project Onyx completely overhauled the Local Exhaust Ventilation system. System served critical areas. Removed existing stainless steelducting from roof area. Supplied and installed UV protected LEV ductwork. Re-bracketed riser duct to supportweight from fan box. Fabricated,supplied and installed new section for top of fan box. This removed pooled water and damage to fan box. Siphoned water fr…

London Road Community College Hospital Gets Fire Damper Testing and Overhaul

25th February, 2017

London Road Community College Services Provided Fire Damper Maintenance Details of Work Onyx carried out the annual fire damper service throughout the site. There were: 257 Motorised dampers 105 Spring loaded dampers As part of the service, engineers confirmed locations of each fire damper according to floor plans, assigned a reference number to each in accordance with an agreed method with the cl…

Bi-annual PPM service for Brighton & Hove City Council Buildings of Benefit to Residents

1st February, 2017

Rooftop Extract Fans PPM Service Dates: 2012 - 2023 In 2012, Onyx was awarded the contract to carry out a six monthly PPM service to the rooftop fans over 100 council high rise blocks. This service includes inspecting, cleaning, lubricating and adjusting each rooftop fan as required to increase their lifecycle, efficiency reduce the risk of failure. It was discovered upon appointment of the contra…

American Air Filters (AAF) Supplies Onyx with HVAC Services Contracts

8th January, 2017

Onyx Facilities Services are closely working with one of the UK market leaders in HVAC services (Kitchen Extraction System Cleaning & Maintenance, Air Ventilation System Cleaning & Maintenance, AHU Cleaning & Maintenance and Fire & Smoke Damper Testing & Maintenance). This co-operation has been successfully working for more than 4 years and we always make sure, that all works a…

Deep Clean and Maintenance of AHUs at Royal London Hospital

4th August, 2016

Services AHU Maintenance Details of Work Onyx carried out a deep clean of 75 AHUs. Deep clean consisted of cleaning each component of every AHU. Clean was carried out to TR19 and HTM 03 standards. The project took place over 3 months. Each AHU had an individual report that included a checklist to demonstrate that the units were cleaned and compliant. Photos of each component were taken before and …

Air Handling Units (AHU) get TR19 deep clean at University College Hospital, London

4th August, 2016

Project University College Hospital at Westmoreland Street Services Provided AHU and ductwork clean Details of Work Onyx carried out a total clean of the air handling units and associated ductworks at the site. The system comprised of the following: 7 AHUs ductwork running through 4 floors, 1 kitchen extract and supply, 5 toilet/smaller extract systems. The system was heavily contaminated and was …


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