In hospitals, above all in the operating rooms, the issue of hygiene has the highest priority. Accordingly, hospitals also have special requirements for the ventilation of their buildings.Airbox air handling units in a hygienic design according to DIN 1946/4 comply with these requirements.
Hygiene requirements for the unit casing
- Dirt accumulation should not be made easier by the surface design
- The materials used must be resistant to disinfectants and abrasion resistant
- Side walls and all components which are located in the air flow must be designed with galvanised and coated surfaces
- Floors, including sliding rails which come into contact with condensate of stainless steel or aluminium
- Closed-poured sealing
- All permanently installed components must be accessible through access bays
- All components must be protected during construction from contamination and damage
- Only condensate trays with all-side inclination may be used
- Inspection glass and lighting in filter and fan unit required
Hygiene requirements for the filter
- 2 or 3-stage filtering depending on the room category
- Filter change only allowed on dust air side
- For antimicrobial-coated filters, proof of the effectiveness and toxic safety is required
- Filter differential pressure monitoring without sealing liquid
- Only closed-cell sealing profile may be used
Hygiene requirements for heat exchanger
- Heater frame made of galvanised steel, aluminium fins/copper or galvanised steel
- Cooler frame of stainless steel or aluminium (AIMg), fins coated, aluminium (AIMg) or copper, collector of copper
- All parts in wet areas shall be cleanable
- All condensate connections are to be arranged on the same side
- Cooler must be visible from both sides
- Cooler fin spacing at least 2.5 mm
Hygiene requirements for the heat recovery
- Surface finish of rotor or plate exchanger: Frame galvanised and coated, fins coated with epoxy resin or aluminium
- Pans on the supply and return air side of stainless steel
- Heat recovery systems are to be arranged on the supply air side after the first filter step
- In rooms where no room-spanning recirculation is allowed, only systems are permitted which exclude material transmission from the exhaust air to the supply air
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