In a hospital, ventilation is critical to infection control, patient safety and clinical performance. As healthcare estates age, the air handling units serving theatres, isolation rooms and wards often fall behind current standards. Hospital HVAC refurbishment offers a practical, cost effective route back to compliance without the expense of a full replacement. At Building Ventilation Solutions we have refurbished hospital air handling units for NHS trusts and private healthcare providers across the UK.
HTM 03-01: the compliance backbone
The central reference for healthcare ventilation in England is Health Technical Memorandum 03-01, Specialised ventilation for healthcare premises, published by NHS England. The current 2021 version is published in two parts. Part A covers design, specification, installation and validation, and applies to new installations and major refurbishments. Part B covers ongoing management, maintenance, testing and verification, and applies to all systems regardless of age. An ageing hospital AHU is therefore still expected to be maintained and verified against current requirements, and when refurbished the works should bring it towards the Part A standard. Refurbishment is one of the most direct ways to demonstrate ongoing HTM 03-01 compliance. Projects also intersect with the Building Regulations, including Approved Document L, and design guidance from CIBSE.
Where ageing hospital AHUs fall short
Through our survey work we repeatedly see the same compliance gaps in older healthcare air handling units:
- Filtration that no longer meets the grade required for the space served
- Air change rates that have drifted below design as fans and motors wear
- Failed or degraded heat recovery, raising energy use and cost
- Corrosion and damaged seals allowing air bypass and leakage
- Outdated controls that cannot reliably hold temperature, humidity or pressure
Each of these can be addressed through refurbishment, far more quickly and affordably than a full replacement.
How AHU refurbishment closes the compliance gap
A BVS hospital refurbishment starts with a detailed AHU validation and ventilation survey and condition report. Typical works include upgrading filtration, replacing worn fans with high efficiency EC plug fans to restore design airflow, repairing or replacing coils, renewing corroded panels and seals, and modernising AHU controls so the system can hold and prove its setpoints. The result is a unit that performs to current expectations, supports the relevant air change rates and pressure regimes, and can be verified against HTM 03-01 Part B.
BVS hospital case studies
At NHS Hammersmith Hospital, BVS carried out an AHU refurbishment within a live healthcare environment, restoring reliable, efficient performance while keeping the surrounding departments operational. See the NHS Hammersmith Hospital AHU refurbishment case study. For a private hospital in Bath, we delivered a refurbishment that brought ageing plant back to dependable, energy efficient operation, programmed to protect patient care. See the Bath private hospital AHU refurbishment case study. Our full case studies library shows the breadth of our experience across regulated environments.
Refurbishing without disrupting patient care
Refurbishment is generally faster than replacement, can be phased so that areas are taken offline one at a time, and avoids the major structural work, craneage and long lead times of a new unit. BVS plans every healthcare project around clinical priorities, coordinating closely with estates and facilities teams to keep wards, theatres and treatment areas running.
Arrange a hospital ventilation survey
Hospital HVAC refurbishment is a proven way to meet HTM 03-01 compliance, improve energy efficiency and protect patients and staff while controlling capital spend. If your healthcare estate has ageing air handling units, the first step is a professional survey. Contact the BVS team to arrange a site visit, or explore our hospital ventilation services to find out more.