Tronic In-line Duct Exhaust Fan 100mm Mixed Flow

Our review

This is a 100mm in-line duct exhaust fan from Tronic, built around a mixed flow design. Instead of the usual axial or centrifugal arrangement, it moves air along the duct in a way that suits longer runs and moderate resistance, which is why mixed flow units are often chosen for ducted ventilation rather than simple wall-mounted extraction. The body is full ABS plastic, described as lightweight but strong, and it is double insulated, so no separate earth connection is needed at the fan itself.
It suits someone planning a ducted extract route, for example a bathroom, kitchen or utility area where the fan sits inside the duct rather than at the wall. Before buying, check the duct diameter matches 100mm, confirm the mounting position gives access for wiring and cleaning, and think about whether your run is short and straight or longer with bends, since that affects whether mixed flow is the right choice. Compare against axial fans for short direct runs and centrifugal fans where higher pressure is needed.