Standards & Conventions

PERFORMANCE

Fan performance is derived from tests carried out in accordance with BS848:Part1:1980 Test Method C. Our test procedures have been verified by the CSIR (report DEF99/033) to be strictly in accordance with the standard. Performance tolerances are Class B as defined in BS848:1980.

 
BALANCING 

All impeller/shaft assemblies are dynamically balanced in accordance with international standards to ensure smooth, vibration free operation. The standards adopted are:

ISO 2372 Acceptance level below 1,8mm/sec.
ISO 1940 Grade G6,3.

 
CLASSES OF CONSTRUCTION 

Six standard classes of construction, defined by impeller tip speed, are available. The limiting speeds are:
 
Cl1 = 50m/sec. Cl2 = 63m/sec. Cl3 = 80m/sec.
Cl4 = 100m/sec. Cl5 = 125m/sec. Cl6 = 160m/sec.

 
IMPELLER DIAMETER RATIOS

Fan selection is optimized by varying impeller diameter ratio. Four variations, relative to nominal impeller diameter, are available. These are:
A = 0,90 x Nom. Dia. 'B = 0,95 x Nom. Dia. 
C = 1,0 x Nom. Dia.  D = 1,05 x Nom. Dia.

 
FAN ARRANGEMENTS

Fans are available in standard arrangements as indicated
    

Arrangement 1
Arrangement 2
Arrangement 4 
Arrangement 4a
Arrangement 5
Arrangement 7

Belt Drive - Single Inlet
Belt Drive - Double Inlet
Direct Drive - Single Inlet - Floor mounted
Direct Drive - Single Inlet - Inlet mounted
Direct Coupled - Single Inlet
Direct Coupled - Double Inlet

 
DISCHARGE ANGLES

Standard angles of discharge, in 45 increments from 0 to 225, are available as indicated. These are offered in both RIGHT HAND (CW) and LEFT HAND (CCW) rotation, as viewed from the fan DRIVE SIDE. The diagram shows Right Hand rotation. 

 
MOTOR POSITIONS

Four standard motor positions are available as indicated for belt driven fans.

 
ACCESS DOOR POSITIONS

Standard access door positions are as shown and are determined when the fan is viewed from the DRIVE SIDE. These positions are independent of fan discharge angle, i.e. 360 remains at top centre regardless of the fan discharge angle.

 
INLET BOX POSITIONS

Standard inlet box positions are as shown and are determined when the fan is viewed from the DRIVE SIDE. These positions are independent of fan discharge angle, i.e. 360 remains at top centre regardless of the fan discharge angle.