Our easy to fit duct kits are made up of our most popular items supplied in one cost effective pack. They can be used for any type of ventilation air extract system as the grille and duct are standard sizes. We include a generous 3 meter length of duct that should be ample for most installations that can be easily cut to size with general purpose plyers. All of our grilles have removable covers/flaps for easy cleaning. Things to consider when choosing a kit: All major brand cooker hood, tumble drier, extractor fan flanges have a small end that allows ducting hose fir over. Our kits will fit all of them. The exact size of our duct is 102mm, 127mm or 152mm diameter so please take this into consideration when choosing a hole saw. We recommend that you use following minimum diameter hole saw per kit: 100mm kit – 125mm hole saw 125mm kit – 152mm hole saw 150mm kit – 173mm hole saw