The Cleanliness Classification of Ventilation Products

The M1 Cleanliness Classification of Ventilation Products is a classification system developed in Finland for assessing the cleanliness properties of ventilation products. The classification sets criteria for product cleanliness and odour, and its purpose is to support the implementation of clean ventilation systems.

What is M1 Cleanliness Classification?

Introduced in 2001, the M1 Cleanliness Classification of Ventilation Products is a voluntary classification system developed in Finland. It assesses the cleanliness, odour and cleanability of ventilation products in accordance with the M1 criteria. Indoor air quality requires indoor air factors to be considered throughout the design, construction and operation of a building.

The use of M1-classified ventilation products is one way to consider the cleanliness properties of ventilation products in the design and implementation of a ventilation system.

Benefits of the Classification

Ventilation products meeting the M1 criteria

• The M1 Cleanliness Classification demonstrates that a ventilation product meets the M1 criteria for gaseous and particulate contaminants carried into indoor air.

• An M1-classified ventilation product meets the M1 criteria for odour.

• An M1-classified ventilation product meets the product-group-specific M1 criteria for cleanability.

The classification system is based on multidisciplinary expertise and impartiality

The Cleanliness Classification of Ventilation Products is owned by Rakennustietosäätiö RTS sr and operated by Rakennustietosäätiö RTS’s subsidiary Rakennustieto Oy. The classification is overseen and developed by the principal committee Indoor Environment (PT 41) appointed by Rakennustietosäätiö RTS sr, in which representatives include construction products industry, developers, designers,and research institutes. Classification applications and matters related to classification decisions are handled confidentially by a separate impartial classification committee.

The classification decisions are based on the document Classification of Indoor Environment 2018 (Sisäilmastoluokitus 2018), the general rules of the classification and the classification criteria.

The Cleanliness Classification of Ventilation Products is part of the Classification of Indoor Environment

The voluntary Cleanliness Classification of Ventilation Products is part of the broader Classification of Indoor Environment (Sisäilmastoluokitus) developed by the Finnish Society of Indoor Air Quality and Climate and Rakennustietosäätiö RTS sr.  

The Classification of Indoor Environment was published for the first time in 1995 and has since been updated in 2001, 2008 and 2018. The Classification of Indoor Environment is used by architects, designers, contractors, and manufacturers when building healthier and more comfortable buildings.