VENTILATION
The workshops include both classroom presentations and practical demonstrations on some of the key equipment delegates will come across.
requirement of CIBSE Guide M for some time, but now a significant inclusion in the new HTM.
Under the new guidance, AHU equipment now has to be replaced every 20 years, and undergo a major service every 10 years. Air-handling units (AHU) are often ‘out of sight and out of mind’, and it is not unusual for equipment to be 30 to 40 years’ old. New-build environments where a series of AHUs are installed at the same time will require significant planning and forward thinking to avoid operational downtime to meet the guidance. HTM 03-01 sets out the best practice methods of design, installation, and validation. We discuss how and where we can implement this guidance. Any deviation or contractual derogation away from HTM 03 should be carefully considered and discussed with the hospital Authorised Engineer (Ventilation) AE (V) and Ventilation Safety Group to allow scrutiny from key people within the organisation.
Sustainability Net Zero plans – the balance between the amount of greenhouse gas produced and the amount removed from the
atmosphere – and what the NHS may look like in 10 years, form a key part of our discussions during the workshop. We showcase examples of good practice – hospitals already focused on meeting the objective – including a Manchester-based hospital looking to achieve Net Zero in its anaesthetic teams and the gases that they use. We assess how air-handling unit (AHU) technology can support Net Zero ambitions, and what is available in critical systems, heat recovery options, control philosophy, and refurbishment options. We debate the pros and cons of components including runaround coils, heat plate exchange, thermal wheels, and cabinet AHUs. Operating theatre layouts are assessed,
as well as the implications of ultraclean ventilation installations, including ductwork layout configuration and the mathematical calculation for air change rates. We discuss how the centrifugal fan sits in position, and how it interacts with the system’s supply duct in any ultraclean ventilation arrangement.
Validation Howorth regularly attends sites on behalf of NHS Trusts to validate newly designed
and installed equipment. As a result we can provide real-life, detailed insights into best practices, what to avoid, and how the Authorised Person (Ventilation) should manage the situation when new equipment is handed over to clinical teams. Filter testing is discussed (DPC highlighted in HTM 03, but we also cover DOP for H14/EU14 Filtration), and how the AP(V) should witness the situation on site to ensure that the equipment under assessment is correctly tested, using the correctly calibrated equipment. We explain the airflow measurement test, and how we arrive at 80% of the terminal footprint at 2.0 m and 36% at 1.0 m. We also discuss exponential airflow, which is a new addition to our CPD sessions this year; it features specific sections on laminar and turbulent flows off the UCV terminal, and how this can be impacted. We emphasise how the AP(V) should
‘witness test’ the procedure so that there is absolute certainty of compliance and patient and surgical site protection prior to final, independent validation. Finally, we explain the non-entrainment test, its rationale, and how it is executed. The test is commonly misunderstood, and is much
February 2023 Health Estate Journal 51
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