They are produced as high efficient, leaning back wings and direct
coupling FGM**0 ve FGM**3 . They are preferred in ventilating, air
conditions, clean and rare dusty ventilating plants.
They are produced from alimunium sheets and cr-ni fort he hot and
corrisive envoirements as being produced as ST**7 standart
materials .The impeller backward curved blades.
