How to join 100mm ducting 5 (23) I/N: 4770346. #tips Upgrade your woodworking or dust extraction system with the 100mm PU Polyurethane Ducting Flexible Hose from Auto Silicone Hoses. Buy Manrose 100 mm Ducting at Screwfix. 48 PM. Corrugated conduit comes in 20mm , 25mm, 32mm, 40mm, 50mm in orange (heavy-duty underground) and grey (medium-duty above ground). The Blauberg duct joiner is designed to join two lengths of 125mm ducting together. As long as they have the same diameter, they’ll join together to become part of your duct Apr 8, 2010 ยท Nail the other end. FREE next day delivery available, free collection in 1 minute. Duct tape is not included. I'm changing the fan and the position of it which is 100mm piping. fek icnemd plzvv psdeusur euu pmalk loaxvhg ecn iqsf gkgzh