The work of an abattoir in slaughtering of beef cattle and pigs presents no air pollution control issues. Where poultry are slaughtered on an industrial scale there has to be extraction from the production line where the mechanised slaughtering occurs. The extraction system can be expected to carry feathers and possibly other solid or aerosol matter (blood, fragments of skin etc). The application is challenging because of the nature of the pollutants and the fact that feathers float. AAF RotoClone type W is a unique solution for this application.