Opticlimate Carbon FilterOverview The Opticlimate (OC) Carbon Filter panel on the unit's air intake must be replaced every 8 weeks. You can choose a pack of 3 carbon filters for continuous use for 24 weeks. The pack is part of the high performance range of Opticlimate spares. It's made for use with the OC closed loop climate system. The carbon filter filters the air of pests and unwanted particles. It's made to have low impact on the levels of airflow. General Information The