Home / Ducting / Ductmaster Thermal - Rectangular / Insulated Rectangular Reducer Insulated Rectangular Reducer £10.80 DUCTMASTER THERMAL 220x90mm to 204x60mm insulated reducer. Insulated Rectangular Reducer quantity Add to basket SKU: NTD-220-RED204 Categories: Ducting, Ductmaster Thermal - Rectangular Tag: Thermal Ducting Product ID: 10542