Gearboxes can be exposed to a huge amount of pressure when used in harsh environments and remote locations. In these situations external cooling is not always available requiring incredibly reliable drive units. Our vertical mixer gears incorporate a bi-directional fan with optimised housing design. This works to provide high thermal capacity and eliminates the need for any external cooling in extreme ambient conditions. Robustly built, David Brown Santasalo AMF gear units feature proven drive technology in operation in hundreds of vertical mixing applications around the world.