The Mini Rotorvent is a revolving anti downdraught chimney cowl designed to fit smaller flues & is also suitable for use on landfill sites & methane vent pipes Fits flues 80–180mm flue sizes Stainless steel rotor structure Pressure die cast aluminium base Revolutionary fin-fixing method which combines threading the fin through the collar of the structure & finishing with spot welding Stainless steel hookbolt fixings (smaller than Rotorvent) suitable for use on twin wall flue pipe Tested & certified under new regulation BSEN 16475-7:2016 & BSEN-1856-1:2003 For areas of consistently high wind speeds a static chimney cowl such as the Colt Top may be more appropriate.