Quiet Pack In-line Centrifugal Twin fans - QPTW

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

Impellers

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.

Motors

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.

Performance

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.

Accessories

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