Home / Ducting / Ductmaster Thermal - Rectangular / Insulated Rectangular to Round Plenum Insulated Rectangular to Round Plenum £6.56 – £9.47 DUCTMASTER THERMAL insulated rectangular to Ø100mm round plenum. Available in 2 sizes. Size Choose an option204x60mm220x90mm Clear Insulated Rectangular to Round Plenum quantity Add to basket SKU: N/A Categories: Ducting, Ductmaster Thermal - Rectangular Tag: Thermal Ducting Product ID: 10533