1. Application
They can be delivered for gas mixtures or vapour containing combustibles and explosives, for ordinary air, for sea air containing salt fog, for air containing oil fog and other corrupt air supply or  extracition.
Theses explosion-proof fan series are best suited to pumping out gas mixtures or vapour containing combustibles and explosives in oil cabins holds, pump-rooms, battery cabins, ammunition cabins, hangars, paint houses, etc . They can also be used for ventilation of other compartments of shipping and corresponding place of land's.
AC 50HZ,380V or 60HZ,440V type YB-H (explosion-insular)  for marine use may be mounted on these fans.
2. Operation Conditions
For places where there are explosive gas
mixtures of grade.
 Ambient temperatures: -25℃ ~ +50℃
 Relative humidity of the air: ≤95%
     Cyclical vacillation: 22.5°~ 45°
     Sustained horizontal tilting: ±15°
     Sustained vertical tilting: ±10°
     Vibration: existent
     Shock: existent

3. Structural Types
     There are three structural types: type I (deck type), type II (piping type) and type III (separate cabins type).The construction is spark free.
     Type I explosion-proof fan has a hood and an explosion-proof motor installed in the top of the machine frame and a wire mesh guard with 2 openings per square cm. Made of stainless steel, surrounding the frame, The fan is vertically fixed on the deck . It may be used for pumping or sending air.
    Type II explosion-proof fan has no hood, built-in type explosion-proof motor is mounted on the housing by the down stream guide vane, It can be installed vertically of horizontally, and can also be installed on the deck. It may be used for pumping or sending air.
According to the customer’s special requirement, the fan can be made into type III, type IV and type V, the fan and the motor are put in different cabins, with a driving device, a sealed box and two airs of flexible couplings. It is used primarily for exhaust of dangerous compartment.
    Type III can be installed horizontally; type IV and type V can be vertically fixed on the deck, and delivered for air supply or air extraction.
4.Features
    Explosion-proof，safe and reliable in operation.
Well anticorrosive.
Strongly capable of resisting vacillation、vibration and shocking.

5.Type Explanation
The type of explosion-proof fans are expressed
by the first letter of the Chinese phonetic name, the casing inner dia.(cm), the standard speed, and the power of the explosion-proof motor, etc.
For example:

   Abbreviated to  CBZ-90AⅠ

Where:
C —— for marine use
B —— explosion-proof

Z —— axial fan
90 —— the casing inner dia.90cm
A—— type of the impeller, type A impeller
7.5 —— the power of the explosion-proof 7.5KW
1460 ——standard speed: 1460r/min
I —— the structural type, type I

6.Gradingang Groupiong of Dangerous Explosives Mixtures (Table I)

7.  Main Property Parameters and Outline Dimensions （Table 2）

 The performance parameters shown in table 2 are based on the air conditions of absolute pressure 101325 Pa, temperature +20℃, relative humidity 50%, and density
1.2kg/ m3.  That is: standard air conditions.
   In the case of other air conditions and rotatory speed different from table 2, the performance of the explosion-proof fan can be computed according to the following formulas:

Q=Q0·                ( m3/h )

P=P0·()2·         ( Pa )

N=N0·()3·         ( KW )

Where Q₀ , P₀ , N₀, , n are respectively the flow rate, the pressure, the power and the air density under the standard air conditions and the standard speed n0; Q, P, N,;and n are the actual flow rate, pressure, power, air density and speed separately.

8. Notes to purchasers
8.1. When ordering our products, please inform us the following details: the size number, structural type, flow rate, pressure, speed,  rotating direction, the outlet position of the fn; the type and power of the motor, etc.
8.2. Supply of the machine as a complete set includes an explosion-proof fan fixed together (including an explosion-proof motor).
8.3. Please give us your detail information when you need a grade IIC explosion-proof fan or other special need.
8.4 By your request, the following items may be supplied to and please include them with your order:①vane wheel,②dismounting tool for vane wheel,③casing,④driving device,⑤coupling.

9. Precaution
9.1. The hard particulate matter in the combustible and explosive gas mixture is mot allowed to be more than 150mg/m3, and its maximum diameter cannot exceed to 2 mm.
9.2. On the duct intake side, provide a protective brass wire nets to ensure the prevention of foreign matter and electrostatic sparks from invasion, protection class of outlet to not less than IP10, and inlet to not less than IP 20, so as to insure the explosion-proof fan operating safely.
9.3. When a power cable is inserted in the terminal box and fixed there, the terminal box itself and its approaching device must be sealed tightly with the cable, and no permeation of rain water into the terminal box is allowable,
9.4. Be sure to earth the cable, especially the flameproof motor.
9.5. Explosion-proof fan installation should be carried out with much care in connecting with the duct so as not to allow any casing distortion to take place owing to forceful tightening,

9.6. The cable entry thread of the flame-proof motors are shown in table 3.
9.7. Our products can be exchanged, returned and repaired if found its quality unsatisfactory within 18

10. Use and maintenance
10.1 Before installing the fans, should check whether each part is intact, whether the components are complete, whether the impeller and casing rotating direct are concordant.
10.2 When installing the duct of the inlet and outlet, should make the duct and fans be spontaneous identical, not join them forcing, not bring the weight of duct on the fans.
10.3 After installed the fans, check whether there is friction of collide between the impeller and the fixed parts by rotating the impeller. If collision, friction, loud noise or strong vibration happened, the fan should be restart after checking. Avoid the fan being bumped and other substance or liquid entered the fans. Please clean the dust on blade of impeller in time, so as not to break the balance and strengthen the noise.
10.4 The  fans should be started-up while the inlet is opening,
10.5 After the fans wiring, the terminal box should be sealed, avoid the air or water in it.
10.6 As the fans operating, the motor electric current should be control strictly, not exceed the rated electric current. Avoid the motor burning,
10.7 The fans maintain must be done on stop working time. When burning, after check, should whether the every part of fans is normal.
10.8 As some fault occurred in fans operating, should find out the reason in time and think a way of resolution.