Weiss Ducting Extension 100mm x 3m SKU: 320114 MODEL: HSD100/3 Error. try again later You've successfully joined the club $ 19 .98 each Available on orders $50 to $1500. More info × Mitre 10 Variants Standards approved ducting. Most suited for bathroom and laundry applications. Features and benefits 100mm ducting. 3m extension kit.