Which diameter should you choose? Measure the inside of your duct, from edge to edge through the centre: your measurement is the diameter to order (Ø80mm, Ø100mm, Ø125mm, Ø150mm, Ø160mm or Ø200mm).
Set of three filters compatible with UNELVENT IDEO 325 ECOWATT and INITIA 225 dual flow units: G4 coarse filtering on the incoming flows and M5 medium filtering for fine particles, in the original dimensions for fitting without adaptation. On a dual flow system, the filters are the only routine maintenance: neglected clogging makes airflow drop, increases energy use and can trigger the unit's safety cut-outs. A spare set in stock means a ten-minute job instead of a week without ventilation.
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