Specialised healthcare ventilation

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Specialised healthcare ventilation

Health Technical Memoranda

Health Technical Memorandum (HTM) 03-01 is a guidance tool for designers, clients and healthcare providers to establish the most effective ventilation solution, encompassing health and safety, patient and staff care, maintenance and inspection and support through design. VES AHU design adheres to HTM guidelines and specific client requirements.

The correct information pre-design is very important from the outset, to establish the best solution for the location and areas that air is being provided for, Typical areas within healthcare premises where ventilation systems are considered critical within the HTM design and specification process, either from a single room or throughout a suite of rooms include operating suites, critical care areas, airborne isolation facilities, invasive treatment rooms, containment level 3 laboratories, pharmacy, sterile services and operative imaging units.

Air handling unit design and its component plant items have their own individual guidelines and reasons for their application.

VES typical plate heat exchanger is one example of a specialised healthcare ventilation solution designed to meet HTM 03-01 compliance as well as health and safety of patient care and staff.

Typical plate heat exchanger

Access doors: Minimum 500mm hinged access for component cleaning. If section is under 1m tall then the access section must be 600mm minimum. Double latch entry for pressurised sections.
Frost / Fog coil: Finless plain copper tube, LPHW preferred but electric heating can be used where necessary.
Pre filter: These are to be grade ISO ePM10 ≥50% (M5) constructed with metal frames. Complete with magnahelic gauge.
Protective coating: Internal smooth coated finish on all units. External coating for weatherproof units available in a choice of colours
Inlet / Outlet cowls: Coated, bolt on, maximum velocity 2.0m/s with 12mm protective mesh. Optional cowls supplied loose.
Case construction: All units built with aluminium tubular frame and galvanised steel sheet panels tested to BS EN 1886 to achieve Thermal Bridging (TB2), Thermal Transmittance Class T2 and Deflection Class D1. Factory airtightness test pre-delivery, Class L2 test at +700Pa and -400Pa, Site airtightness test; Class L2 +700/ - 400Pa.
Channel base: Channel size to meet trapping requirements ranging from 150mm minimum up to 300mm typically.
All dampers: Motorised, with C3 2% low leakage galvanised steel blades, metal cogs and linkages. Spring return actuator with end switches available on request.
Fans: High efficiency EC fan and motor, with quick change plug connections, located on the bottom deck where possible. Various fan arrangements are available including fan walls, to improve redundancy for scheduled maintenance.
Heat exchanger: ErP 2018 EU1253 73% minimum efficiency aluminium plate heat exchanger with face and bypass damper. Thermal Wheel or Run Around Coil also available. Heat exchanger section internal panels constructed from stainless steel. A fully accessible or removable stainless steel drain pan is also included.
Attenuators: Sound absorbing infill protected by perforated sheet metal and protective membrane.
Secondary filter: These are to be grade ISO ePM1 ≥50% (F7) rigid bag filter, front clip in and withdrawal, with magnehelic gauge.
Viewing ports: Viewing ports for component and task operation with IP56 inspection lights from central AHU switch all wired with low smoke zero halogen cable.
Traffolyte labelling: 100mm AHU identification labelling. Individual component labels.
Cooling coil: Copper tube and fins, electro tinned or polyester coated, < 2.0m/s face velocity. Complete with separate removable moisture eliminator. Cooling coil section internal panels constructed from stainless steel. A fully accessible or removable stainless steel drain pan is also included.
Lifting beam: Extended lifting beam for quick fan change.
Drain pan: Fixed stainless-steel drain pan with 500mm cleanable access to both sides, and 1-20 fall in all directions. If access for cleaning is not possible drain pans will be fully removable.
Heating coil: Constructed from copper tube and fins. LPHW coil preferred but electric heating or a reverse cycle DX coil can be used when necessary.