Not only since the Corona pandemic has it been true that ventilation and air-conditioning systems and devices have the task of creating a supply air quality that meets the hygiene requirements of VDI 6022 and thus making their contribution to healthy indoor air.
Dangerous germs, bacteria and molds can multiply due to insufficient cleaning and disinfection, incorrect components on the system or incorrect operation, among other things, and thus pose a serious health risk.
The VDI 6022 series of guidelines applies to all common rooms in buildings in which people spend more than 30 days per year or regularly more than 2 hours per day.
Air handling systems and their centralized and decentralized components that influence supply air quality are tested. Pure exhaust air systems are normally not subject to the inspection requirement as long as they do not influence the supply air quality due to their design.
The intervals for the VDI 6022 hygiene initial inspection and repeat inspections are every 3 years for AHUs without humidification, and every 2 years for AHUs with humidification.
The operator is responsible for hygienic operation and maintenance in accordance with the ArbStättV (Workplace Ordinance) and the Ordinance on Industrial Safety and Health.
Since the 2018 update, decentralized air handling units such as recirculating air coolers or split air conditioning indoor units (wall evaporators, ceiling cassettes, etc.) also fall under the inspection requirement.
An initial hygiene inspection must be carried out as a minimum:
On newly constructed air handling units after completion, but immediately before commissioning,
after significant changes to the AHU, if possible before further use,
on all existing air handling units on which no initial inspection has yet been carried out.