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© FANTECH
2016
C-5
AXIAL FLOW FANS PERFORMANCE DATA
C
AXIAL FLOW FANS GENERAL INFORMATION
Handing
Right and left-hand blades are available enabling the selection of contra-rotating or
multi-stage axial flow fans up to 2000mm diameter. If contra-rotating fans of a
larger diameter are required please refer to our sales department.
Standard Material
GRP blades will be supplied for normal clean ventilation applications as standard
except where otherwise specified, or where local regulations prohibit their use.
Balance
The balance of all impellers is carefully checked before leaving our facilities to
ensure vibration-free running.
Fully-adjustable Blades
All impeller pitch-angles are fully adjustable. For the Elta Range, up to size 1400,
the required blade angles are set on jigs but sizes up to 1000 may also be set
utilising the graduated scale at the root of each blade. For the Elta 2000 Range,
pitch angle setting is by protractor.
OPERATING SPEEDS AND TEMPERATURES
Impellers installed for O.E.M. applications are submitted to the vibration, cyclic
torques and temperature cycles that prevail within the item of equipment. It can
therefore be misleading to state maximum conditions unless the full operating
environment is known, as all the above points can be inter-related.
The table below should be used as a guide only. For accurate figures use the
Fantech Product Selection Program.
REVERSAL OF AIR FLOW
Air flow direction can be reversed on fans fitted with three-phase motors
by simply reversing the direction of rotation.
The impact on performance in reverse rotation approximates to:-
Air flow reduction
-30%
Pressure reduction
-55%
Power reduction
-25%
TRULY REVERSIBLE
Equal volume flow in both directions can be achieved by blade reversal
procedures carried out when the impeller is being assembled.
The impact on performance when compared to standard performance
approximates to:-
Air flow reduction
-15%
Pressure reduction
-25%
Power reduction
-20%
Blade Material
Temperature Range Limiting Tip Speed**
Elta 1000 Impeller*
Aluminium
-40°C to +200°C
115m/s
GRP
-40°C to +70°C
95m/s
Nylon
-40°C to +100°C
115m/s
Anti-static GRP
-40°C to +70°C
95m/s
Elta 1400 & 2000 Impellers
#
Aluminium
-40°C to +200°C
105m/s
GRP
-40°C to +70°C
95m/s
Anti-static GRP***
-40°C to +70°C
95m/s
* Up to 1000mm diameter ** Applicable to 20°C *** 1400 Series only
#
1400 Series = 800mm to 1400mm; 2000 Series = 1250mm to 2000mm