Arrangement
Direct driven Single or Multi stage fans suitable for vertical or horizontal mounting.
Staging Of Axial Flow Fans
By running two Long Cased Fans in series with contra-rotating impellers, it is possible to achieve up to three times the pressure of a single stage fan of equal diameter and speed.
Long Cased Type
In this instance the casing covers the entire length of the motor and impeller and an inspection door is provided. Essentially for duct mounting where flanges are bolted back and front.
Short Cased Type
The casing covers the impeller track and a portion of the motor projects beyond the end of the flange. Best installed at the end of a duct or on Air Conditioning equipment.
Motors
In most instances foot mounted TEFC IEC 600034-1. Electric motors are fitted with metric dimensions. The motors are selected to cover the ‘peak’ power absorbed for fan blade pitch angle and speed. Most standard motors have Class ‘F’ insulation and are suitable for operating at temperatures of up to 50°C (122°F). Higher temperatures available if required.
The standard voltages are 220, 230/380, 380, 240/215 and 460. Motors can be wound for any voltage and frequency and also for dual voltage. The use of standard foot mounted motors of this type guarantees inter-changeability in most countries of the world with machines of similar speed/kw. INVERTER CONTROLLED, FLAMEPROOF, SINGLE PHASE, 2 SPEED AND COMPANY SPECIFICATION MOTORS CAN ALWAYS BE OBTAINED.
Standard Impellers 250-1250mm Dia
Impellers have aerofoil section polypropylene blades fitted into a die-cast aluminium hub. Five different blade angles are available and each blade is individually replaceable in the event of breakage. Aluminium blades are also available in selected angles.
Special Impellers 250-2000mm Dia
Impellers have aerofoil variable pitch aluminium blades fixed into a die-cast aluminium hub.
Fractional Solidity Impellers
All sizes of impellers can supplied with varying number of blades to suit the application. This has the effect of reducing the static capability of the fan whilst retaining a high efficiency.
Example of Coding
A typical example of coding is 630/9/35 indicating :
- 630 diameter in mm
- 9 number of blades
- 35 blade angle in degrees
Extra Features Available
Mounting feet, flexible connections, AV Mountings, Mating Flanges, Inlet Cones, Guards, Back-draught shutters, Special Paint. Finishes: External Terminal Box.
Finish
- Standard Fans: Galvanised
- Optional Finishes: Epoxy Resin, Metal Spraying
