Quiet Pack Twin Fan (QPTW) - In-Line Twin Fans

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Prices and stock levels correct at the time of printing (25/02/17 21:55)

 commercial industrial

The all Quiet Pack Twin in-line twin 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 Twin fan shall be manufactured from prime quality galvanised sheet steel, for mounting internally as standard or with a special treatment for externally mounting, ensuring a robust in-line fan for those tough site conditions.

Casings shall be 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 Twin fans are to be suitable for circular ducting ranging in sizes 100, 125, 150, 160, 200, 250, 315, 400 and 500mm, with air volumes from 0.028m3/s to 1.008m3/s and pressure development of up to 430Pa.

They shall be specially designed to allow the unit to be mounted via drop rods or anti vibration mounts, ensuring a quick and easy solution to installation with all units fitted with backdraught shutters to prevent air flow returning back through the system during shutdown periods


The forward curved centrifugal impellers shall be aerodynamically designed, utilising computer technology. The motor and impeller shall be factory matched, statically and dynamically balanced on precision machines, to ISO 1940 Grade 6.3., to give quiet, vibration free running. The aerodynamic blades and motor housing shall be manufactured from prime quality galvanised sheet steel.


Motor insulation Class B, suitable for operating temperatures from -15°C up to +40ºC and atmospheres up to 95% RH.

All sizes are ideally suitable for speed control by electronic or voltage reduction. Roof Units would recommend that a voltage reduction Auto Transformer speed controller is used with all units to ensure minimum noise levels during speed control and to eliminate any possibility of harmonic noise levels which 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

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.


Full ranges of accessories are available with the option range of fans such as:

• Manual/Auto Changeover Twin Fan Controllers
• Auto Transformer Speed Controllers
• Electronic Speed Controllers
• D.O.L. Starters
• Standard, Acoustic & Thermal Flexible Ducting
• In-Line Attenuators
• Wall & Roof Terminals
• Fast Clamps
• Weatherproofing



1. Drop rods (up to M8) can be used on the base flange when mounting the unit upside down.

2. AVM’s can be fitted to either side or the base of the unit.

3. An access provision above the lid of each unit, no less than the respective A dimension must be made.

Unit Size A B C D E Approx Weight (kg)
QPTW100B 290 635 171 450 97 24
QPTW125B 290 635 171 450 122 24
QPTW150B 340 635 203 550 147 24
QPTW160B 340 635 203 550 157 24
QPTW200B 340 770 203 550 197 35
QPTW250B 495 1015 320 750 247 43
QPTW315B 595 1015 300 750 312 61
QPTW400B 595 1015 300 750 397 87
QPTW500B 595 1015 300 750 497 131

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