1. Classification of Indoor Climate 2008 (abbreviation used in Finland: SL 2008) Literature reference: Classification of Indoor Environment Target Values, Design Guidance, and Product Requirements. Finnish Society of Indoor Air Quality and Climate. FiSIAQ publication 5. Trinklet Oy. Helsinki (The document can be found in electronic form in Moodle)
Marianna luoma

2. History of the Classification
The first Classification of Indoor Climate, Construction, and Finishing Materials was published in 1995
Classification of Indoor Climate 2000
Classification of Indoor Climate 2008
The Finnish organizations behind the classification are:
(The Finnish Society of Indoor air Quality and Climate)
(Building Information Foundation RTS)

3. The use of the Classification
The Classification supplements the National Building Code of Finland
The Classification does not overrule the official building codes
Used mainly in new constructions
Gives target and design values for better indoor climate
Can be used by the building owners, designers, equipment manufacturers, contractors, and maintenance personnel
Can be used as an appendix of specifications of construction and mechanical systems of new buildings

4. The goals
To design and construct healthier and more comfortable buildings and their mechanical systems
Guidelines for manufacturing better air-handling equipment and building materials
Gives target and design values for better indoor climate

5. The sturucture of the Classification of Indoor Environment

6. Procedure for using the classification in a building process
The developer and the future building owner choose the target values for indoor climate
The design team describes the technical solutions
The construction cleanliness class and the cleanliness class of air-handling systems are chosen
The emission class for building materials and cleanliness class of air-handling components are chosen
All persons that are involved in the design and building process have to be aware of the goals and have to follow the practical guidelines that are given in the ”Classification of Indoor Environment 2008”
It is assumed that by following the above mentioned procedure, the indoor climate in the new building will meet the the target values of the chosen indoor category S1, S2, or S3

7. Indoor climate categories
There are three categories: S1, S2, and S3
The classification gives both a verbal description and technical target values for each category
The target values are given for:
thermal conditions
acoustic conditions
air quality
illumination

9. Target values for thermal environment, S1

10. Target values for thermal environment, S2

11. Target values for thermal environment, S3

12. Target values for air velocity
Category
S1 (individual)
S2 (good)
S3 (satisfactory)
Temperature
21 °C
<0,14 m/s
<0,17 m/s
<0,2 m/s (winter)
23 °C
<0,16 m/s
<0,20 m/s
25 °C
<0,18 m/s
<0,25 m/s
<0,3 m/s (summer)

13. Target values for indoor air quality
CO2-concentration, ppm
<750
<900
<1200
Radon concentration, Bq/m3
<100
<200
Stability of the conditions
-offices and schools
95%
90%
-residencies
80%

14. 2. Guidance for design and construction
Construction cleanliness categories are called P1 and P2
The target values of S1 and S2 indoor climate categories are generally achieved by applying P1 for construction work and air-handling system, and by using M1-class building materials. M1-classified building materials are low emitting materials.
Water and moisture control plan of the construction site is needed
Information about the indoor climate classification is given for all participants of the building process and training sessions for the workers are arranged

15. Air-tightness of the building envelope
Recommended value for the single family houses
n50 < 1,0…2,0 1/h
Recommended value for other buildings
n50 < 0,5…0,7 1/h

16. Design values for outdoor air flow rates, examples…
Dwellings, dm3/s,person 12 8 6
Offices, dm3/s,person 16 13
1,5 dm3/s, m2
Meeting rooms, dm3/s,person 9
There are more values for different buildings and rooms

17. The cleanliness classification of air-handling systems: The requirements of cleanliness category P1
The supply air ducts and fittings shall be manufactured using cleanliness class M1 air-handling components
The sealing materials are selected from emission class M1 or M2 building materials
The average amount of dust on the inner surface of a new air-handling system shall not exceed 0,7 g/m2 (measured or visually estimated)
Return air is not used in the air-handling system
The supply air filter fulfills the requirements of European Class F8/EU 8 and a pre-filter is used

18. The requirements of cleanliness category P2
The supply air ducts and fittings shall be manufactured using cleanliness class M1 air-handling components
The average amount of dust on the inner surface of a new air-handling system shall not exceed 2,5 g/m2
Return air is not used in the air-handling system
The supply air filter fulfills the requirements of European Class F7/EU 7 and a pre-filter is used

19. Storage and installation of air-handling components
The protective covers of the components shall be removed only just before installation
Dirt shall not accumulate into the air-handling system during installation
Burrs, screws or other items shall be removed from the inner surfaces of ducts
The use of excessive amount of sealants shall be avoided
All the open ends of the ductwork shall be capped during the breaks of the installation work
The ducts shall be airtight
The proper functionng of the service and access doors shall be checked

20. Burrs in ducts are avoided
by using an electric cutter
Protection during storage
Protection
Protection during installation

21. 3. Requirements for building products
The goal is to increase the development and usage of low-emitting construction materials
… and better indoor climate
Requirements are given for emission class of M1 and M2
Upper limit values for emissions of TVOC, formaldehyde, ammonia, carcinogenic compounds, no odours, no casein
For example, indoor climate category S1 air quality requirements are usually not fulfilled by using unclassified construction materials or air-handling components

22. Cleanliness classification of air-handling components
The aim is to ensure good quality of the supply air
One cleanliness category: classified or not
The requirements are fulfilled if, after manufacturing, the components satisfies the component group specific requirements
Ducts and fittings, air and fire dampers
Criteria for surface density of oil in ducts, mineral fibres released into air, and surface density of dust
Classification includes ducts, air and fire dampers, supply filters and sound attenuators

23. Indoor air quality in a new building
Usually, the indoor air quality of the new building is good, if the guidance for design and construction is used and emission tested building materials and classified air-handling components are used
Besides, the air flow rates have to be designed according to the design values given
Measurement of indoor air quality is usually not necessary.

24. Factors suitable in maintenance agreements:
Air temperature
Air velocity
Design flow rate
Sound level of heating and air-handling equipment
Acoustic conditions
Radon concentration
CO2 concentration
Illumination

25. Think, how each group benefits from the Classification of Indoor Environment?
Constructor?
Designer?
Air-handling constructor?
Manufacturers?
Users of the building?
Employer?
Maintenance personnel?
HVAC-industry in general?