120 / 416
AXIAL FLOW FANS GENERAL INFORMATION
AXIAL FLOW FANS PERFORMANCE DATA
C-4
© FANTECH
2016
C
MULTI-STAGE AXIAL FLOW FANS
Multi-stage axial fans with contra-rotating impellers can be supplied up to 2000mm diameter.
A two-stage assembly develops approximately 2.4 times the pressure developed by a
single-stage fan and increases the overall sound level by 8 to 10 dB.
To select a contra-rotating axial fan from the curves in this catalogue, divide the
specified static pressure by 2.4 and then select as though it were a single-stage unit.
The kW derived is for one stage only and the noise level will be 8 to 10 dB higher than
the single-stage fan.
NOTE: Reference should be made to Fantech for complete selections of these fan
arrangements. Alternatively selections can be made using the Fans by Fantech Product
Selection Program.
ELTA IMPELLER RANGE
The Elta impeller ranges included in this catalogue have harnessed the latest
technology in axial impeller design, resulting in enhanced pressure development,
energy efficiency and reduced noise levels.
There are three main ranges: -
Elta 1000: 315 to 1000mm diameter using 150 or 250mm diameter hubs.
Elta 1400: 800 to 1400mm diameter using 255 or 350mm diameter hubs.
Elta 2000: 1250 to 2000mm diameter using 400 or 550mm diameter hubs.
For performances beyond those detailed in this catalogue, and for applications such
as mine and tunnel ventilation, please refer to our sales engineers for information.
IMPELLER SPECIFICATIONS
Blades
The blades have been designed for optimal performance, for both aerodynamic needs
as well as noise characteristics. They are available in a range of materials as shown
below:-
Impeller Ranges
The stress limits of the blades vary from one material to another and simplified criteria
are incorporated on the curves. However, if selecting fans using the Fans by Fantech
Product Selection Program, you may find solutions where higher pitch angles are
chosen; these selections are quite acceptable.
It should be noted that, as we are constantly reviewing the materials we use, these
limits may be extended.
Hubs
All hubs use Fantech TECH-LOCK® taper bushes as standard. The bush ensures ease of
fitting and removal of the impeller from the motor shaft should adjustment of the pitch
angle, cleaning or repair of the impeller prove necessary.
Fixings
All impellers are assembled using high-tensile, zinc-plated set screws and self-locking nuts.
Range of
diameters No of blades
Hub Dia
mm Materials
315 to 900 5 or 10
150
GRP, Nylon, Alum. or Anti-static GRP
560 to 1000 7 or 14
250
GRP, Nylon, Alum. or Anti-static GRP
800 to 1250 3 or 6
255
GRP, Alum. or Anti-static GRP
800 to 1400 3, 6, 9 or 12 350
GRP, Alum. or Anti-static GRP
1000 to 1800 3, 6 or 9
400
GRP or Aluminium
1250 to 2000 3, 6, 9 or 12 550
GRP or Aluminium