Outlet Grill with Weatherproof Cowl Protection 100mm White SKU: 187739 MODEL: HSCWL100 Error. try again later You've successfully joined the club $ 22 .49 each Mitre 10 MAvailable at Mitre 10 MEGA stores. Variants External plastic grill to suit 100mm ducting with weatherproof cowl protection. Features and benefits Easy to install. Cowl style hood to prevent backdraft. For use in ducted applications.