VENTILATION
Control of Substances Hazardous to Health, provide cross-flow ventilation, provide comfort, a stable temperature, and humidity, as well as to dilute and control contamination. In June 2021, the revised Health
Technical Memorandum 03-01 (HTM 03- 01) – Specialised ventilation for healthcare buildings, was released by NHS England and NHS Improvement. It provides comprehensive advice and guidance on the legal requirements, design, installation, maintenance, and operation, of specialised ventilation in healthcare premises. During the workshop we also assess
previous Health Technical Memoranda, going all the way back to HTM 2025, and HTM 03-01 (2007), addressing the rationale in line with clinically-led research, as well as CIBSE Commissioning codes of Practice, BSRIA BG49:2015, HTM 00, and HBN 04-01.
An engineer setting up the DOP Test. The equipment on the red trolley is a smoke generator and an aerosol photometer, and the bottle contains CO2
gas for the smoke generator.
day at Howorth. The session focuses on post-operative infection rates prior to and after ‘The Greenhouse’, along with another unique innovation – the Body Exhaust System. Remote and integral UCV options
are assessed, as well as research and development projects that Howorth Air Technology has delivered – in some instances based around ASHRAE standards in international markets. The session also focuses on our involvement in barn theatres, and the design elements and ventilation strategy that should be considered for these surgical facilities, which can be more complex and difficult to design and install.
A global business Howorth Air Technology is a global business, with a reputation for high-quality engineered equipment. A small section of the session acknowledges our in-house expertise and our largest ever single order of US$13 m (£10.5 m), delivered by our pharmaceutical team in 2021. This session also addresses the complexities of delivering high-level, quality projects, and Howorth Air Technology’s inclusive culture, ‘The Howorth Way’, to invest in its people and increase its presence within the community.
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Insights into HTM 03-01: Part A: Design and Validation The main session of the day focuses on the design limitations and considerations of installing ultraclean ventilation (UCV) systems. However, before all this, we go back to basics to ask the question: Why do we ventilate a space? In the course of our work, we have seen hospital treatment rooms set up in what are little more than storage cupboards, with barely any ventilation at all. We have seen air-handling units coated in microbiological growth that are supplying filtered air to operating theatres. The importance of ventilation, indoor air quality, and its associated health benefits, are steadily growing for a number of reasons. The design philosophy of a conventional ventilated operating theatre is based on the need to dilute contaminants and control both the condition and movement of air within the operating theatre.
Increasing the dilution effect Ultraclean ventilation (UCV) is a means of substantially increasing the dilution effect, by circulating large volumes of clean filtered air over the operating zone. During the session, we explain the need to dilute viable and non-viable contaminants, create clean airflow paths, manage the
We go back to basics to ask the question: Why do we ventilate a space? In the course of our work, we have seen hospital treatment rooms set up in what are little more than storage cupboards, with barely any ventilation at all
50 Health Estate Journal February 2023
New ventilation installations The main document of HTM 03-01 covers new ventilation installations, and consists of 13 chapters and 10 appendices – a significant increase in both from the 2007 document. It provides a much more detailed approach to design, and gives clinical reasons why ventilation is required. Under the new guidance, each hospital
or Trust now needs to have a Ventilation Safety Group. During the pandemic, many hospitals and Trusts started to create their own informal groups on ventilation, and to see this formalised is a major step forward, and without doubt one of the highlights of the new HTM 03-01.
The Ventilation Safety Group A Ventilation Safety Group includes a microbiologist and representatives from theatre management, estate management, finance, an Authorised Engineer (Ventilation), and an Authorised Person (Ventilation). It can act as an essential forum to address failures and maintain safety across the Trust. For example, when verification checks are conducted by ventilation engineers, if the equipment is not compliant, the hospital can refer to its Ventilation Safety Group to take remedial action based on the recommendations made – whether this is in connection with sourcing funds to procure new equipment, or scheduling maintenance work. A major part of the discussions also focus on the new air change rates noted in HTM 03-01.
Alterations in fan technology We discuss the reasons for alterations in fan technology directly related to air change rate calculations and the requirements set out in original theatre research, working through the history of HTM 2025 and HTM 03-01 all the way to the current day. The session also focuses on system replacement and upgrade, a
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