... the impeller angle, each type of blades can be mounted by 15°, 20°, 25°, 30°, 35°3. Production Parts:The standard configuration ... air inlet itself bolt connection, the air inlet of fixed by three countersunk screw3. Diffuser be installed into a certain Angle ... plate in a horizontal position.4. After installation, rotating rotor by hand or lever, checking whether there is too close or ...