Slimpak EC Box Twin Fan 400mm

  • Compact low profile design
  • Duct Sizes 100 - 500mm
  • Airflow 0.01 to 1.2m3 /s
  • Pressure up to 650Pa
  • Latest energy saving EC/DC motors
  • Manufactured controlled to BS EN ISO 9001
  • Performance tested to BS848 Part 1 & 2

Product Overview

Ventilation Type
Commercial Ventilation
Product Range
Slimpak EC Box Twin Fan
IP Rating

The new range of Slimpak EC twin in-line duct fans incorporate energy efficient EC motors and basic commissioning controls to offer an energy efficient twin extract fan system.

Manufactured from prime quality galvanised sheet steel the Slimpak (SLPT EC) twin fan units are internally treated with an ‘O’ class rated, BS476 part 6 & 7, acoustic foam, which offers the benefits of high sound absorption, good thermal insulation properties in addition to self extinguishing properties and resistant to ignition.

The housing is designed to be as compact as possible for concealed false ceiling applications yet is suitable for ceiling or floor mounting, nonreturn dampers can be easily rotated on site to suit the application.

Motor / Impellers

All SLPT EC units feature a low energy, Class 1, EC/DC external rotor motor and backward curved impeller assembly specifically chosen for performance and non-overloading characteristics. The assembly is dynamically balanced to DIN ISO 1940 Grade 6.3, duct size 500mm rated IP54, all other sizes, IP44 according to BS EN 60529. Ball bearings are greased for life. Insulation is Class ‘B’ (from -25°C to +60°C).

All models incorporate internal electronic overload protection and soft start function.


Every SLPT EC unit is fitted with a purpose designed common integral commissioning controller giving the ability to set the exact duty required at commissioning. Alternatively the integral potentiometer can be bypassed to allow remote speed control via an external 0-10V potentiometer. Low voltage wiring is kept separate from the mains wiring.


Motors are single phase 230V +/- 10% / 50/60Hz / 1ph (size 100- 400mm) or 400V +/- 10% / 50/60Hz / 3ph (size 500mm), (4 wire systems only).


Extensively tested to BS848 parts 1 & 2. Published dB(A) figures are free field sound pressure levels at 3m with spherical propagation at reference level of 2x10-5 Pa. The inlet/outlet sound power level spectra figures are dB with a reference of 10–12 watts.

Quality Assurance

Design and manufacture are in accordance with the standard for quality management systems BS EN ISO 9001:1994.


A full range of accessories are available with the Slimpak EC range of fans such as:

  • Auto changeover controller designed for EC motors
  • Two speed trickle boost controller
  • Pre & secondary filter cassettes
  • Electric heater batteries
  • Backdraught shutters
  • In-line attenuators

Product Downloads

Installation Instructions

Catalogue Pages

Other Documents


  • Setting range: +6°C to +30°C
  • Two internal range limit/locking rings are included to allow setting within a limited temperature range or locking at a fixed t/o point
  • IP20 rated
  • Sealed sensing mechanism
  • Snap-action, single pole, changeover contacts
  • Mounting direct on surface only
  • Electrical connection to screw type terminals with rear or side cable entry
  • Contact rating: 1.5 amp (inductive)
  • 16 amps (resistive)
  • Max Voltage 250V