For Refresh Midi Recirculation UnitGenuine Britannia replacement carbon filter. Fits Britannia Refresh Midi Recirculation Units.Designed for use where venting to the atmosphere is restricted or costly3 pin commando plug allows users to simply plug in and switch onFilters need to be cleaned or replaced on a regular basisQuick and easy to installFour-stage filtration process removes grease, fine particles, smoke and odoursFor use with electrical appliances - not suitable for gas