scope:

The series of guidelines VDI 6022 applies to all rooms or occupied areas in rooms which are intended for use by persons on more than 30 days per year or more than two hours per day on a regular basis [1].

VDI 6022 Part 1 applies to all ventilating and airconditioning systems and air handling units as well as central or decentralised components thereof (including units such as recooling plants), which influence the quality of the supply air.

Only then will this guideline apply to extract-air systems if these can influence the quality of supply air by recirculation (see also definition of recirculated air in Section 2).

Existing ventilation and air-conditioning systems (see Section 2) operate in non-compliance under a continuation permit in a way comparable to that applying to structural fire protection. In order to ensure continuation of hygiene quality,

• as short-term compensating measures, these systems shall undergo more frequent hygiene checks and hygiene inspections, and simple reconstruction measures shall be initiated im-mediately.

• for long-term and complete implementation of VDI 6022 Part 1, it is recommended that a stepped schedule be defined if the construction allows this.

Prompt reconstruction is required in any case where occupants suffer from obvious discomfort, or where serious hygiene deficiencies are found. Additional requirements, as stipulated by, e.g., the employers' liability insurance associations, shall be observed.