4-72 B4-72 type centrifugal Ventilator  
 

First, Introduction

4-72 type centrifugal ventilator can be used as the indoor ventilator in large buildings and it is harmless to human bodies and it is no corrosion to the steel materials.

Corrosive gas. B4-72 type fan can be used for the ventilation of the inflammable gas. The viscosity gas should be avoided and the grain rate should be less than 150mg/m³. The gas temperature should be less than 80°C. B4-72 type fan performance should be the same with base size and it can be chosen according to the samples.

 second, 4-72 type fan form

   Fan exit position should be determined according to the main case wind exit mouth angle. 4-72 type fan №2.8-6 are made into one type, Users can regulate the position according to the installation requirements. NO2.8 regulation scope can be 0 --225 , interval: 45 . No3.2--6 regulation scope 0 --225 , interval 22,5 . No8--12 regulation scope: 0 --225, interval: 45 . Nol6, 20 wind exit mouth position can be three kinds, O , 90 , l80 , it cannot be regulated and noted when ordered.
Fan driving mode can be A, B, C, D. 4-72 type fan, №2.8--6 adopts A type to drive, №6--12 adopts c, D type to drive, №16--20 adopts B type to drive.

Third, 4-72 type fan structure

       4-72 type fan N2.8A--6A can be made up of impeller, main case, air intake as well as direct connected electric motors.
(1) Impeller can be made up of type blade, curve type front plate and plate back plate. They are made from steel plate or foundry alloy through balancing. It has great air performance, high efficiency, and stable.
(2) Main case can be two types. N02.8--12main case as the main body, and it can not be parted. NO1 6-20 main case can be made up of three types.
(3) Air intake formed the whole set and installed in the back of fan.
(4)The driving part can be made up of principal axis, bearing housing, antifriction bearing, belt pulley or coupler.

 Fourth, 4-72 Ventilator performance parameter