4-70centrifugal fan Structure:
　 The air outlet angles of №2.8～6 type in 4-70 centrifugal fans are0°～225°, with the interval of 45°, type A driven; air outlet angles of №.7～12 fans are 0°、90°、180°, driven types of №.7-12 are C .
No.208-6 in type T4-70 centrifugal fans are mainly composed by impeller, shell, air inlet and direct distribution motor; besides the above mentioned apparatus, №.7～12 also have transmission parts.
　　1) Impeller consists of ten back-swept arc laminate blades, curve front plate and board rear plate. Steel made. Performance balance. With well pneumatic performance, high efficiency and stable running.
　　　2) The air inlet is made in whole set on one side of fan. The section parallel with the shaft is curve, which could make air input freely, with less loss.
　　3) Actuating parts consist main shaft, bearing case, ball bearing and belt wheel

Performance parameter of 4-70 centrifugal fan

Performance parameter table of №.2.8～6A fans in type 4-70