Howden ELF - User Manual

Questions and Answers

F
fwhiteAug 3, 2025
Why is the air volume low in my Howden Fan?
- H
  Hector PetersAug 4, 2025
  If the Howden Fan's air volume is low, several factors could be responsible. The system may be fouled, requiring cleaning of air-cooler bundles or cooling tower fill. Obstacles in the housing or air stream could be present; check the actual total area of obstacles and impeller housing inlet shape against the original selection. If the static pressure is higher than specified or the air temperature is higher than the design temperature, increase the blade angle, but only up to 3 degrees initially, and then perform a selection check. Also, verify that the blade angle hasn't decreased due to rotation of the blades; if so, reset the blade angle and torque the U-bolt nuts correctly.
C
Chad SnowAug 8, 2025
What to do if the vibration level is high in Howden Fan?
- A
  amydominguezAug 8, 2025
  A high vibration level in your Howden Fan can stem from several causes. The impeller may be imbalanced, so check the position of the fan blades according to the instructions. There might be a lack of stiffness in the support structure, requiring reinforcement. Ensure that the bolting of the drive-train connection or fan housing is tight. Incorrect drive alignment can also cause vibration, so realign it. Check for driver bearing damage and repair or replace if necessary. Make sure the drainage holes are open. If the blade is not flush against the lower clamping piece, release the U-bolts, pull the blade outwards, and re-tighten the U-bolts to the correct torque. Also, verify that the blade angles are within ±0.5° tolerance and reset them if needed.
M
Mark WilliamsAug 12, 2025
How to reduce high power absorption in Howden ELF Fan?
- A
  autumncollinsAug 12, 2025
  If the power absorption is too high in your Howden Fan, it could be due to several reasons. The static pressure might be higher than specified, in which case you should decrease the blade angle. If the air temperature is lower than the design air temperature, check the performance against the current air temperature. High airflow or a blade angle that is too large can also increase power absorption; in these cases, decrease the blade angle or set the blade angle according to the fan selection details. Lastly, check the transmission for any issues.
M
Mark VargasAug 17, 2025
What causes high power absorption in Howden ELF?
- W
  wellstracyAug 17, 2025
  If the power absorption is too high in your Howden Fan, one potential cause is fouling of the system. To resolve this, clean the system's air-cooler bundles or cooling tower fill. Another cause could be obstacles in the housing or air stream. Check the actual total area of obstacles and the impeller housing inlet shape against the original selection.
C
Christopher Jones MDAug 21, 2025
What to do if Howden Fan impeller is rubbing?
- L
  Leslie ArroyoAug 21, 2025
  If the impeller is rubbing against the fan casing in your Howden Fan, several issues could be the cause. First, check if the bolting of the drive-train connection, support structure, or fan housing is not tight and tighten all bolts. The impeller may not be centered, so center the impeller. If the tip clearance is too small, decrease the impeller diameter by placing nylon rings between the lower clamping pieces and blade stem collars. Lastly, if the fan casing is too weak, stiffen the fan casing.
D
Darryl MaynardAug 25, 2025
Are hairline cracks on Howden ELF Fan blades dangerous?
- C
  Christian ShannonAug 26, 2025
  Hairline cracks on the blade surface of your Howden Fan are generally harmless, as they typically appear in resin-rich areas around the edges and stop progressing. However, it is advised to fill these cracks with a touch-up material, such as Sikaflex 252, to prevent moisture penetration affecting the blades. Contact Howden for a repair kit.
M
marvin26Aug 29, 2025
How to repair scratches on Howden Fan?
- L
  Luis MillerAug 29, 2025
  If your Howden Fan has scratches or small damages due to transport and handling, it is advised to fill these cracks with a touch-up material, such as Sikaflex 252, to prevent moisture penetration affecting the blades. Contact Howden for a repair kit.

Summary

General Information

Introduction

Provides an overview of the manual's purpose and scope for E-series fans.

Description

Details the features and variations of E-series axial flow cooling fans.

Options; Accessories (at extra cost)

Lists optional components and accessories available for purchase.

Field Service

Explains the availability and benefits of expert support services.

Receiving; Handling; Storage; Disposal

Fan identification

Explains how to identify fan characteristics using a code system.

Receiving and unloading

Covers inspection procedures for damage upon arrival and documentation.

Handling

Provides guidance on safely handling fan blades during loading and unloading.

Storage

Outlines recommendations for storing impellers to maintain their condition.

De-commissioning

Describes the process for disassembling fans for recycling or disposal.

Exploded view and part list

Presents a visual breakdown of components and a corresponding part list.

Installation

Required Tools

Lists the necessary tools for performing the installation.

Rotation and flow direction

Specifies the correct rotational direction and airflow for the fan.

Preparation

Details the steps required to prepare components before assembly.

Coupling flange with parallel bore

Guides on installing the coupling flange with a standard cylindrical bore.

Coupling flange with tapered bushing

Instructs on installing the coupling flange using a tapered bushing.

Hub-plate installation

Explains the procedure for mounting the hub-plate onto the coupling flange.

Blades installation

Provides detailed steps for installing the fan blades onto the hub.

Minimum tip-clearance

Defines and explains how to measure and ensure correct blade tip clearance.

Impeller diameter reduction

Describes methods to reduce impeller diameter if tip clearance is insufficient.

Retaining plate

Details the installation of an optional retaining plate for specific applications.

Balancing

Explains impeller balancing methods and importance for smooth operation.

Commissioning

Preventive Maintenance

Contact Howden

Trouble Shooting

Overview Tightening Torques

Hardware Overview

Guideline for acceptable vibration levels of cooling fans in application category BV-3 (according ISO 14694)

Document Version Control

Summary

General Information

Introduction

Provides an overview of the manual's purpose and scope for E-series fans.

Description

Details the features and variations of E-series axial flow cooling fans.

Options; Accessories (at extra cost)

Lists optional components and accessories available for purchase.

Field Service

Explains the availability and benefits of expert support services.

Receiving; Handling; Storage; Disposal

Fan identification

Explains how to identify fan characteristics using a code system.

Receiving and unloading

Covers inspection procedures for damage upon arrival and documentation.

Handling

Provides guidance on safely handling fan blades during loading and unloading.

Storage

Outlines recommendations for storing impellers to maintain their condition.

De-commissioning

Describes the process for disassembling fans for recycling or disposal.

Exploded view and part list

Presents a visual breakdown of components and a corresponding part list.

Installation

Required Tools

Lists the necessary tools for performing the installation.

Rotation and flow direction

Specifies the correct rotational direction and airflow for the fan.

Preparation

Details the steps required to prepare components before assembly.

Coupling flange with parallel bore

Guides on installing the coupling flange with a standard cylindrical bore.

Coupling flange with tapered bushing

Instructs on installing the coupling flange using a tapered bushing.

Hub-plate installation

Explains the procedure for mounting the hub-plate onto the coupling flange.

Blades installation

Provides detailed steps for installing the fan blades onto the hub.

Minimum tip-clearance

Defines and explains how to measure and ensure correct blade tip clearance.

Impeller diameter reduction

Describes methods to reduce impeller diameter if tip clearance is insufficient.

Retaining plate

Details the installation of an optional retaining plate for specific applications.

Balancing

Explains impeller balancing methods and importance for smooth operation.

Commissioning

Preventive Maintenance

Contact Howden

Trouble Shooting

Overview Tightening Torques

Hardware Overview

Guideline for acceptable vibration levels of cooling fans in application category BV-3 (according ISO 14694)

Document Version Control

Howden ELF Specifications

General

Brand	Howden
Model	ELF
Category	Fan
Language	English

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Howden ENF

28 pages

Howden ELF - User Manual

Table of Contents

Questions and Answers

Summary

General Information

Introduction

Description

Options; Accessories (at extra cost)

Field Service

Receiving; Handling; Storage; Disposal

Fan identification

Receiving and unloading

Handling

Storage

De-commissioning

Exploded view and part list

Installation

Required Tools

Rotation and flow direction

Preparation

Coupling flange with parallel bore

Coupling flange with tapered bushing

Hub-plate installation

Blades installation

Minimum tip-clearance

Impeller diameter reduction

Retaining plate

Balancing

Commissioning

Preventive Maintenance

Contact Howden

Trouble Shooting

Overview Tightening Torques

Hardware Overview

Guideline for acceptable vibration levels of cooling fans in application category BV-3 (according ISO 14694)

Document Version Control

Summary

General Information

Introduction

Description

Options; Accessories (at extra cost)

Field Service

Receiving; Handling; Storage; Disposal

Fan identification

Receiving and unloading

Handling

Storage

De-commissioning

Exploded view and part list

Installation

Required Tools

Rotation and flow direction

Preparation

Coupling flange with parallel bore

Coupling flange with tapered bushing

Hub-plate installation

Blades installation

Minimum tip-clearance

Impeller diameter reduction

Retaining plate

Balancing

Commissioning

Preventive Maintenance

Contact Howden

Trouble Shooting

Overview Tightening Torques

Hardware Overview

Guideline for acceptable vibration levels of cooling fans in application category BV-3 (according ISO 14694)

Document Version Control

Howden ELF Specifications

Related product manuals