AIR HYGIENE TEST SUITABLE FOR ALLERGIC PEOPLE
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1 Scope of Test and Assessment Criteria for the Issue of the TÜV NORD Test Mark INDOOR AIR HYGIENE TEST SUITABLE FOR ALLERGIC PEOPLE for Indoor Air Purifiers (as at 08/13) I General The aim of these tests, which are performed on a voluntary basis for the manufacturer, is to make an assessment in terms of indoor air hygiene of indoor air purifiers with regard to their effectiveness in cleaning indoor air of fine particulates, taking special account of allergenic indoor substances. Furthermore, the indoor air purifier is examined in longterm operation to establish whether germs are emitted. If the indoor air purifier is equipped with components which may emit ozone, the unit is also tested with respect to the ozone emission rate. II Basis for the test The tests and examinations to be performed before the TÜV NORD test mark is issued are based on the recognised technical rules and standards, such as ISO and DIN standards and VDI regulations from the area of ventilation and filtering and clean air technology. In addition, the recognised medical / allergological test methods relevant to dealing with such problems are used.
2 Page 2 of 5 The tests and examinations are conducted among other things in accordance with 1) VDI guideline 2066: "Particulate matter measurement Dust measurement in flowing gases" 2) VDI guideline 3867: "Measurement of particles in ambient air Determination of the particle number concentration and paticle size distribution of aerosols" 3) DIN EN 481: "Workplace atmospheres; Size fraction definitions for measurement of airborne particles" 4) DIN EN 779: "Particulate air filters for general ventilation" 5) DIN EN 1822: "High-efficiency particulate air filters (EPA, HEPA and ULPA)" 6) DIN EN 13725: "Air quality Determination of odour concentration by dynamic olfactometry" 7) DIN ISO 7708: "Air quality - Particle size fraction definitions for health-related sampling" 8) DIN EN ISO 3744: "Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering methods for an essentially free field over a reflecting plane" 9) DIN EN ISO 5167: "Measurement of fluid flow by means of pressure differential devices" 10) DIN EN ISO : "Indoor air Part 9: Determination of the emission of volatile organic compounds from building products and furnishing Emission test chamber method" 11) ISO : "Road vehicles Test dust for filter evaluation; Arizona test dust" 12) ISO : "Indoor air Determination of odour emissions from building products using test chambers" 13) WHO: "Air quality guidelines" 14) TRGS 402: "Determination and assessment of the concentrations of airborne hazardous substances in working areas" 15) RAL-UZ 122: "Basis for awarding environmental labels Hardcopy devices" 16) BIA: "Measuring of harmful substances Working paper 'Determination of exposition by chemical and biological influences'" 17) German Research Foundation, Senate Commission on the Investigation of Health Hazards of Chemical Compounds in the Work Area: MAK and BAT Value Lists 18) Allergen analysis by means of monoclonal antibodies ("ELISA test")
3 Page 3 of 5 III Basic tests 1 Measurement of air flow rates, power input and sound power levels 1.1 Volumetric air flows at all power settings 1.2 Electrical power input at all power settings 1.3 Determination of sound power/pressure levels at all power settings *) *) These measurements are performed if sound power/pressure levels are specified for the unit. 2 Measurement of cleaning performance at all power settings Test conditions Test room: 40 m 3 Test aerosol: paraffin oil Intensity level of the test aerosol in the room air at the beginning of the measurements: 10,000 3 Filtration measurements 3.1 Filtration measurements regarding indoor air dust at maximum power setting - Fraction separation degrees 0.3 µm to 10 µm 3.2 Filtration measurements regarding test dust A2 according to ISO The feeding of the test dust proceeds in 2 loading stages with a total of 1g/h, and 3 measurements per loading stage are performed. 3.3 Filtration measurements regarding bacteria and allergens Bacteria and allergens are fed as part of conditioned house dust, specified as follows: - Particle size range... < 100 µm - Concentration of mite allergens Der p1 1) and Der f1 2) µg/g - Concentration of bacteria... > 10 5 cfu/g 3) The feeding of the conditioned house dust proceeds in 2 loading stages with a total of 1g/h; 3 measurements per loading stage are performed. - Retention efficiency of bacteria (average value from all measurements) - Allergen emissions (Der p1 and Der f1) 1) Der p1: Major allergen of the mite dermatophagoides pteronyssinus 2) Der f1: Major allergen of the mite dermatophagoides farinae 3) cfu: Colony-forming units (unit for reproducible germs)
4 Page 4 of Filtration measurements regarding mould spores The unit is operated with pure indoor air which is enriched with spores of pure mould cultures of Penicillium and Cladosporium. Concentration aspired: approx. 1,000 cfu/m³ The measurements are evaluated regarding retention efficiency of mould spores. 4 Long-term test with indoor air dust at maximum power setting Operating time of the indoor air purifier: a total of 12 weeks, 8 h/d Measurements are performed every 3 weeks; they are evaluated regarding the following parameters: - Retention efficiency of mould spores Germ colonisation on the clean air side at the end of the operating time 5 Measurement of the ozone emission rate according to RAL-UZ 122 *) *) These measurements are only performed if the unit is equipped with components which may emit ozone. IV Measurement of odour reduction according to DIN EN **) **) These measurements are performed if odour filtration is a feature of the unit. V Test mark 1. Taking the results as per III and provided the assessment criteria specified in VI are fulfilled, TÜV NORD hereby grants permission to use the TÜV NORD test mark. 2. TÜV NORD will draw up a certificate and release it for duplication for informative and marketing purposes. 3. The scope of services to be provided by TÜV NORD relates to the indoor air purifier submitted for testing. If there are changes of type or major conversions, the basic tests described in III must be performed again. 4. Use of the TÜV NORD test mark involves an annual test of an indoor air purifier taken from production or storage by TÜV NORD. 5. Minor production-related changes, e.g. different filter qualities, mean that a retest is necessary; this is included in the scope of services provided for the periodic tests. 6. If defects are found during the periodic tests, they must be rectified within three months.
5 Page 5 of 5 VI Assessment criteria The indoor air purifier is assessed as part of an interdisciplinary expert appraisal taking account of the current state (as at ) of recognised environmental-medical threshold values for air constituents. The following criteria must be fulfilled before the TÜV NORD test mark is awarded: 1. Deviation from specified ventilation and electrical data (III.1): 5 % 2. Deviation from specified sound power levels (III.1): 2 db 3. Separation efficiency regarding particles 10 µm in tests with indoor air dust (III.3.1 and III.4): 95 % 4. Separation efficiency regarding the respirable dust fraction (particles 7 µm) in tests with indoor air dust (III.3.1 and III.4): 90 % 5. Separation efficiency regarding particles 10 µm in tests with test dust A2 (III.3.2): 98 % 6. Separation efficiency regarding the respirable dust fraction (particles 7 µm) in tests with test dust A2 (III.3.2): 96 % 7. Separation efficiency regarding bacteria in tests with conditioned house dust (III.3.3): 95 % 8. Clean air allergen content in tests with house dust (III.3.3): < 1 ng/m³ 9. Separation efficiency regarding mould spores (III.3.4 and III.4): 85 % 10. Germ colonisation on the clean air side (III.4): None 11. Ozone emission (III.5): < 15 µg/m³ 12. If promotional statements are issued with regard to filter qualities (e.g. High Efficiency Particulate Air filters) the filters are subject to the assessment criteria laid down in the relevant standards.
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