NuAire NALMF Series Installation And Maintenance Download Page 1

Isolation - Before commencing work make sure

that the unit, and any control are

electrically isolated from the mains supply.

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. 17. Leaflet Number 671522

The EMC Directive 
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/EC  

The Low Voltage 
directive 
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5/EC

Introduction

The NALTMF range of in-line cylindrical cased mixed flow

fans are constructed with a rigid galvanised steel case. 

The case has pre-drilled flanges and is finished in black

polyester powder coat. 

The high efficiency mixed flow design impeller is 

manufactured in aluminium or high density polymer.

The external rotor motors with ‘sealed for life’ bearings 

are maintenance free. Class F insulation in IP54 rating. 

Suitable for operating in atmospheres up to 95% RH 

and ambient temperatures up to 40

O

C. 

1.0 Handling

Always handle the fans carefully to avoid damage and distortion.

Care should be taken to ensure that any slings used for lifting

purposes do not damage or pass through the impeller. 

Always check the unit weight on rating label before lifting.

2.0 Dimensions (mm) & Weights (kg)

Fan Code 

Weight

NALMF350-41

567 541 503 310 12  9.5 17 

Kg

NALMF400-41

636 605 560 340 16  11.5  23 

Kg

NALMF450-41

709 674 635 420 16  11.5  35 

Kg

NALMF500-41

785 751  711  450 

16  11.5  63 

Kg

NALMF560-43

872 837 797 490 

24  11.5  63 

Kg

3.0 Installation

Installation must be carried out by a competent person in 

accordance with the appropriate authority and conforming to all

statutory and governing regulations i.e. IEE, CIBSE, COSHE etc.

The units can be installed at any angle and are suitable for 

internal or external use. The fans are designed to be bolted into

proprietary ductwork and pre drilled flanges are incorporated.

Anti-vibration mountings are recommended to minimise noise

and vibration. 

The method of mounting used is the total responsibility of the

installer. 

All duct connections must be airtight to prevent any loss of 

performance.

4.0 Technical Data

Amps Amps

Fan Code 

Phase 

RPM 

kW

flc 

sc

NALMF350/41 1 

1390 0.31  1.35  3.7

NALMF400/41 1

1280 0.52 2.2  5.5

NALMF450/41 1 

1330 0.96 4.3

9.6

NALMF500/41 1 

1310  1.45  6.1

15

NALMF560/43 3 

1350 2.4 

4.3  20

5.0 Electrical

Motor

External rotor motor, has sealed for life bearings and class F

insulation. A thermal contact switch is incorporated to prevent

damage due to overheating.

Connection Details

Check that the fan details on the rating plate correspond with

the supply voltage and frequency. 

The fan unit incorporates a terminal box on the casing exterior.

Units for external use require weatherproof conduit and glands.

Motors are designed for Direct On Line starting. 

Motor overloads should be set to the full load current on the fan

rating label. 

Supply fuses should be H.R.C. type.

Start up Procedure

Note single phase rotational direction is set at works and

should NOT be altered. Equipment should be run for 

approximately 30 minutes to ensure correct operation.

If a fault occurs, switch off. 

Do not restart until fault has been rectified. 

Electrical Note - 

Because the run and start currents depend

upon the duty and associated duct work of an individual unit,

the values quoted in the table are nominal.

Run currents will be exceeded if the unit is operated beyond the

operating curve shown in the performance catalogue.

Wiring diagrams shown overleaf.

NALMF 

Cylindrical Cased Mixed Flow Fans

Installation and Maintenance

Fig. 1.

A

E = No. Holes
B = PCD
F = Dia

Airflow

B

C

D

Nuaire: A Trading Division of Polypipe Limited  

Western Industrial Estate

 

Caerphilly  United Kingdom  CF83 1NA  

T: 029 2088 5911  F: 029 2088 7033  E: [email protected]  W: www.nuaire.co.uk

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