Metal grease filter for Cata TFB-2003 extractor hoods (1 pair) Exhausted mode: In this mode, the extracted air – passing through the grease filter – goes outside through a pipe system or into a ventilation chimney designed for this purpose. It is important that with this version, we also ensure the inflow of fresh air, because this is the only way for the devices to work with sufficient efficiency, not to mention that it is not enough to exhaust the used air, it is also important to supply it properly. Depending on use, the metal grease filter should be cleaned once a month. The metal grease filter can be washed by hand, but can also be washed in the dishwasher. In the case of internal circulation mode, the use of an activated carbon filter is also required: our range of activated carbon filters