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Scope of the programme

The programme scope covers Air Cleaners for residential (domestic) and tertiary (stores, offices, classrooms, waiting rooms…) sector applications.

The programme applies to eligible models of Air Cleaners. To be eligible, each model shall be certified according to the certification rules of the “NF-536 Air Cleaners” certification mark.

The NF-536 reference document is available on


Air Cleaner

Electrically powered device basically built of a fan and a set of components possessing the ability for collecting and/or destroying (partially or fully) air pollutants. This definition covers all types of technology: mechanical filtration, electrostatic filtration, plasma, ionization, UV-A or UV-C lamp, etc.

Clean Air efficiency

The Clean Air Efficiency (CAE) of a given pollutant category is defined as the ratio between the minimum initial purified air flow rate value of the category and the absorbed electrical power, both measured for the maximum operation speed.

The Clean Air Efficiency is rounded down to nearest second digit and expressed in [m3/h/W].

The Clean Air Efficiencies are expressed as follows :

Clean Air efficiency

Clean Air efficiency class

An efficiency class is determined for each of the 4 categories of pollutant from the corresponding Clean Air Efficiency (CAE) values.

Table 1 : Clean Air Efficiency thresholds for each efficiency class

Clean Air Efficiency class

Clean Air Efficiency value


13 m3/h/W ≤ CAE


7 m3/h/W ≤ CAE < 13 m3/h/W


5 m3/h/W ≤ CAE < 7 m3/h/W


2 m3/h/W ≤ CAE < 5 m3/h/W


CAE < 2 m3/h/W

Initial purified airflow rate

The initial purified air flow rate QAEi [m3/h] is defined for the pollutant identified by the index i
QAEi=Ei . Qmax .100
Where Ei [%] is the purification efficiency with respect to the pollutant identified by the index i

  • i = 1 for inert particles of 0.3 µm to 0.5 µm size
  • i = 2 for inert particles of 1.0 µm to 2.0 µm size
  • i = 3 for inert particles of 3.0 µm to 5.0 µm size
  • i = 4 for Acetone
  • i = 5 for Acetaldehyde
  • i = 6 for Heptane
  • i = 7 for Toluene
  • i = 8 for Formaldehyde
  • i = 9 for Staphylococcus epidermidis
  • i = 10 for Aspergillus niger
  • i = 11 for Fel-D1 cat allergen

and where Qmax is the air circulation flow rate at maximum speed

Recommended room surface area

The recommended room surface area [m2] indicated is the maximum of the room surface areas calculated for each pollutant as described in the NF-536 reference document. This is why the labelling specifies “up to X m2” with X the recommended room surface area. It is considered that the room has a ceiling height of 2.5m.

Certified performance items and associated tolerances

When tested in the laboratory the obtained performance data shall not differ from the declared values by more than the following tolerance values:

Air circulation flow rate [m3/h]:                                                         -5%
Initial purified air flow rate [m3/h]:                                                    -5%
Sound power level [dB(A)]:                                                      +2 dB(A)
Absorbed electrical power [W]:                        Maximum [+5 % ; +1 W]


Certification manual / Manuel de certification


OM (Operational Manual)
RS (Rating Standard)