The motor installation mode B3 is the most common horizontal installation (generally horizontal), and it can be directly installed on the foundation member with the help of motor legs. B3 motor has no directly connected mounting flange (see the figure below).
V5 is directly installed on the wall through the motor base, with the transmission end shaft facing down. Mounted V5 motor is characterized by two end covers, which extend axially downwards and have legs, and are installed on the wall or structural foundation. This is a special kind of motor, which is equivalent to horizontal motor structure and installed vertically.