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 40OC.
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 A B C D E F 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.
