ANNEX II Measurements and calculations

2. DOMESTIC RANGE HOODS

2.4. Calculation of the Grease Filtering Efficiency (GFE_hood)

The Grease Filtering Efficiency (GFE_hood) of a domestic range hood means the relative amount of grease retained within the range hood grease filters. It shall be calculated and rounded to the first decimal place as:

Where:

— w_g

=

the mass of oil in the grease filter, including all detachable coverings, in g and rounded to the first decimal place,

— w_r

=

the mass of oil retained in the airways of the range hood, in g and rounded to the first decimal place,

— w_t

=

the mass of oil retained in the absolute filter, in g and rounded to the first decimal place.