ACF Series Carbon Pocket Filters are made from a filter media impregnated with activated carbon and offer a very low level of grease and odour control for kitchen extracts. Our Carbon Pocket Filter is made with a special carbon impregnated media is sewn into pockets and mounted onto a metal frame & fit into duct work in Kitchen Extract Systems to capture grease and odours/smells given off by cooking. They should be changed regularly to make sure you have good clean and safe ventilation in the kitchen.