The programme scope covers the particulate and combination (particulate and gas) filters used in a residential ventilation unit and for which the following applies:
The programme scope covers filters for which the face area is lower than or equal to 300 mm x 600 mm.
For the RFIL programme, the certify-all requirement as defined in the Certification Manual is applicable from 2020, January 1st(see Operational Manual OM-21 for further details).
Mass of contaminant mc [mg] removed from the gas stream by adsorbion on the filter.
The basic design of a filter designates the arrangement of the filtering area which can be the following:
Clean Air efficiency
The Clean Air Efficiency for Residential Air Filters (CAERFIL) can be defined as the amount of clean air delivered by the filter per unit of consumed energy [m3/h/kWh/a].
The Clean Air Efficiency is calculated from certified performance items:
The Clean Air Efficiency is calculated as follows (see Rating Standard RS/4/C/003 for further details):
A combination filter designates a particulate filter which material or extra layer(s) present(s) additional filtration properties, intrinsically or after being treated or coated, such as gaseous filtration.
A filter family is characterised by the following:
Among these data, the following must be available via internet or published sales brochures: basic construction, filter media, ISO group for filter classification.
Efficiency of the clean filter operating at a given flow rate.
The symbol ePMx describes the initial efficiency of a filter element to reduce the mass concentration of particles with an optical diameter between 0,3 μm and x μm.
Initial pressure drop
Pressure drop of the clean filter operating at a given flow rate.
ISO ePMx class reporting value
Class reporting value, corresponding to the initial efficiency ePMx value rounded downwards to the nearest multiple of 5 percentage points, in conjunction with the group name.
Example: ISO ePM1 85%.
ISO groups for filters classification
The ISO groups for filters classification are defined as per document Eurovent 4/22:2015, excluding ISO Coarse which is not part of the RFIL certification programme scope.
The symbol ePMx,min describes the minimum efficiency value of the conditioned (discharged) filter element, operating at a given air flow rate, to reduce the mass concentration of particles with an optical diameter between 0,3 μm and x μm.
Rated maximum airflow
Maximum operational air flow for the filter as recommended by the manufacturer. It is expressed in [m3/h].
Specific Energy Consumption of a residential air filter
The Specific Energy Consumption of a residential air filter (SECRFIL) is the expression of the energy consumed by the fan to overcome the pressure drop caused by the filter in a given Residential Ventilation Unit.
This value, expressed in [kWh/m2/a], is calculated from the initial pressure drop as follows (see Rating Standard RS/4/C/003 for further details):
When tested in the laboratory the obtained performance data shall not differ from the declared values by more than the following tolerance values:
Initial pressure drop values +10%+Mt or +10 Pa +Mt
Initial efficiency values -5 percentage points (absolute deviation)
Minimum efficiency values -5 percentage points (absolute deviation)
Filter ISO ePMx class reporting value -5 percentage points (absolute deviation)
Adsorption capacity -10%