The Aspirotor has a long standing record of successful operation in both Europe and the UK in the curing of downdraught in both flue and chimney systems. Whatever the weather, no matter how hard the wind blows, the stainless steel turbine head maintains efficient draw in the flue. In situations where the draw on the system is insufficient, the Aspirotor will assist in generating an efficient draw on the flue. The Aspirotor has been widely used to ventilate away the dangers of methane gas on land fill sites. Designed to fit chimneys and flues 180mm x 235mm (7.2 - 9.4) internal diameter. Easy secure fitting with stainless steel strap. For use on all fuel systems, gas, oil, wood, coal. Stainless steel turbine head, cast aluminium base. Easy fit using four stainless steel hook bolts and wing nuts. Twin high temperature (up to 200c) oil filled bearings for a smooth, quiet operation. Only requires a wind speed of 4mph to start turbine head rotating Easy clean facilities, swivel head as standard to allow easy cleaning of system. Tested and certificated to BS715:1993 and BSEN 1856-1:2003. Please note chimney and flue systems must be swept before any terminal is fitted to avoid possible problems in the future. Please note the chimney is not supplied. This item is natural - uncoated.