Hygiene inspections in accordance with VDI 6022

Hygiene inspections in accordance with VDI 6022 ensure that your ventilation technology complies with current guidelines. With our clear documentation, we provide you with an overview and transparency: This minimizes your follow-up costs!

For several decades, VDI 6022 has been the standard guideline in the field of hygiene for ventilation and air-conditioning technology. Within the scope of a hygiene inspection according to VDI 6022, the complete air handling system including the air duct network is subjected to a functional test and the microbial growth is determined at representative points.

As an operator of a ventilation system, you will benefit in the long term if hygiene inspections are carried out in accordance with VDI 6022. The maintenance of a ventilation system according to the guidelines of VDI 6022 represents a continuous process, which is associated with investment costs, but ultimately ensures comprehensive hygiene safety!

Services of hygiene inspection according to the highest possible standard:

Overall microbiological assessment of ventilation systems

Conformity inspection

• Visual inspection of air handling units for compliance with specified requirements and hygiene deficiencies
• Inspection of accessibility of air handling units, individual components and parts
• Documentation by means of a VDI checklist with 104 detailed questions on the condition of the entire air handling system

Physical assessment

• Determination of broom cleanliness by visual assessment. The following representative locations are to be inspected: Supply air duct, floor in the central unit, recirculation air duct, secondary air duct, exhaust air duct (if supply air quality is affected); in addition to the visual impression, the negative assessment of dust contamination is to be confirmed by a wipe test with the palm of the hand (with glove) and photo documentation.
• Extended visual inspection of the AHU for hygiene defects such as dirt, corrosion, deposits, damage (fiber discharge, etc.), belt abrasion, condensation, visible mold growth.
• Photo documentation and description of physical defects.

Constructional assessment

• Photo documentation and description of apparent or obvious design deficiencies such as non-sealing filters, housing leaks, non-existent accessibility, improper condensate drainage, etc.

Microbiological sampling

• Microbiological surface sampling of hygiene-relevant individual components and parts such as: Heat exchangers, condensate trays, droplet separators, humidifier chambers, silencers, etc. by means of impression plates.
• Determination of sampling points and marking in the outside area of the air handling unit
• Microbiological surface sampling to determine the surface colony count:
  - RLT systems with humidification: 6-8 sampling points (total 18-32)
  - RLT systems without humidification: 4-6 sampling points (total 12-24)
• For the determination of bacteria and molds (with differentiation on genus level), 1 x Caso agar, 1 x DG-18 or 1 x malt extract agar must be used per sampling point.
• Airborne germ measurement in one supplied room per RLT system plus a comparison air measurement (reference measurement) of the outside air, or room air. For each airborne germ measurement or measuring point, 1 x Caso agar must be used to determine the total colony count of bacteria and 1 x malt extract agar must be used to determine the total colony count of mold. For each airborne germ measurement or measuring point, the molds are to be differentiated at the genus level.
• Microbiological examination of the humidifier water (evaluation according to total germ count, Legionella spec. and pseudomonads)