Quiet Pack Acoustic In-Line Box Fan 400mm

  • ‘O’ Class rated acoustically treated casing, ensuring minimum duct and breakout noise levels
  • Air volumes up to 1.59m3/s
  • Suitable for external pressures up to 500Pa
  • Designed to suit duct diameters from 100 to 500mm
  • Operating Temperatures from -15°C up to +40°C
  • Speed controllable
  • Quality Assurance to BS EN ISO 9001:1994
  • Performance tested to BS848 Part 1 1980

Product Overview

Ventilation Type
In-line Fans
Product Range
QP (Quiet Pack inline box fan)

The Quiet Pack in-line acoustic fans shall be as supplied from Roof Units, designed around a high performance centrifugal impeller, offering a highly efficient, quiet and compact in-line acoustic fan.

The Quiet Pack fan range is manufactured from prime quality galvanised sheet steel, ensuring a  robust in-line fan for those tough site conditions.

Quiet Pack casings are suitable for internal mounting only and internally treated with an ‘O’ class rated acoustic foam, which offers the benefits of excellent low level duct bound and breakout sound levels, in addition self extinguishing properties, zero burn rate, resistant to ignition, and no toxic fumes.

Quiet Pack fans are suitable for circular ducting ranging in sizes 100, 125, 150, 160, 200, 250, 315, 200 and 500mm, with air volumes from 0.016m3/s to 1.8m3/s and pressure development of up to 500Pa.

The casing are specially designed to allow the unit to be mounted via drop rods or anti vibration mounts, ensuring a quick and easy solution to installation of the Quiet Pack in-line acoustic fans. All manufacturing progressed of the Quiet Pack fan units are computer designed and controlled to BS EN ISO 9001 Standards.

The motor and backward curved impeller shall be factory matched, statically and dynamically balanced on precision machines, to DIN ISO 1940 Grade 6.3, to give quiet, vibration free running.

Motor insulation Class B, suitable for operating temperatures from -15°C to +40°C and atmospheres up to 95% RH. All sizes are ideally suitable for speed control by electronic or voltage reduction. Vent-Axia would recommend that a voltage reduction Auto Transformer speed controller is used with all Quiet Pack units to ensure minimum noise levels during speed control and to eliminate any  possibility of harmonic noise levels which may occur when using electronic speed controllers at lower speeds.

The fan performance, shall be in accordance with tests to BS848 Part 1 1980, with the fan sound levels, measured in a reverberant chamber in accordance with BS848 Part 2 1985.

Quality Assurance
Design and manufacture shall be in accordance with the standard for quality management systems BS EN ISO 9001:1994.

Product Downloads

Installation Instructions


Duct Air Heater 12kW 400mm Three Phase
  • Supply and extract fan outputs
  • Combined temperature and airflow sensor
  • Run on timer
  • Solid state switching - no mechanical switching breakdown
  • Indicators for control status
  • High temperature limit and manual reset
  • Separate supply and extract fan outputs for heaters
    over 150mm diameter
Circular Attenuator 900mm Length 400mm
  • Low cost - exceptional performance
  • Ex stock availability
  • Sheet steel casing and end plates
  • 30 minute fire rating as standard
  • Fitted spigot for direct connection to circular ductwork
Unitex Wall Terminal Large Louvre 400mm Diameter, 280mm Length
  • External weather louvre, wall sleeve and duct connection spigot in one unit
  • Satin anodised louvre gives full weather protection
  • Epoxy powder coated finish, weather louvre available as optional extra
  • 280mm or 80mm wall sleeve section
  • Spigot connections from 100mm to 400mm
5 Amp Single Phase Electronic Speed Controller
  • Separate starter not required when used with HOT SPOT protected fan (SPTK only)
  • Compact and easy to install
  • Suitable for surface or flush mounting (SP5010 surface only)*
  • SP type include ON/OFF switch with neon indicator
  • SPTK type include ON/OFF/RESET switch and indication light fan trip indicator and built in facility for manual reset
  • Complies with required statutory regulations and carries CE mark