Home / Ducting / Ductmaster PVC - Round / Backdraught Shutter Backdraught Shutter £1.99 – £2.69 DUCTMASTER PVC in-line backdraught shutter. Available to purchase in 3 sizes. Size Choose an option100mm125mm150mm Clear Backdraught Shutter quantity Add to basket SKU: N/A Categories: Ducting, Ductmaster PVC - Round Tag: PVC Round Ducting Product ID: 10329