Recirculation mode is the most energy-saving operating mode. The air is cleaned by an odour filter and directed back into the room. The room temperature is not altered. It is also simple to implement, because wall penetrations and exhaust channels are not required. Due to their large volume, berbel charcoal filters
are especially efficient at odour-binding and absorb up to 97% of bad smells. A further advantage of the berbel recirculation filter: only the proactive carbon needs to be changed – not the entire filter – and it only needs to be replaced every two to three years depending on how hard the filter has to work. The berbel refill pack is available for a cost-effective and environmentally friendly replacement.