Powerduct SPD
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The Powerduct SPD range of duct mounted square cased in-line centrifugal fans is a robust unit designed around high performance, low noise characteristics, and suitable for extract or supply for a wide variety of applications.

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Learn more about individual features and benefits of our products.

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The Powerduct SPD range of centrifugal fans as manufactured by Elta Fans Ltd.

Technical information


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SPP Features and Benefits

Features & Benefits

Material strength

Powerduct SPD fans have a robust casing design for added strength and durability. Casings are manufactured in pre-galvanised sheet steel which is suitably stiffened, with all motor supports powder coated after manufacture.

Inspection access

All units are supplied with an inspection hole which means the correct rotation of the impeller can be checked for ease of commissioning and general maintenance checks.

Quality Impeller Design

Aerodynamically designed backward curved impellers which are constructed from aluminum or galvanised sheet steel and dynamically balanced to quality class G6.3 to maximize efficiency.

Square ducting

Casings incorporate metric flange connections to suit industry standard duct sizes which means they can be installed quicker and easier.

Quality assurance

All units are designed and manufactured with procedures as defined in BS EN ISO 9001: 2008.

Ease of installation

All motors are pre-wired to an integral IP55 terminal box on the outside of the casing so they are ready for customer installation.

Full accessory range

Speed controllers, mounting brackets, anti-vibration mounts, flexible connectors and silencers.

SPP Specifications


The Powerduct SPD range of centrifugal in-line fans as manufactured by Elta Fans Ltd. 46 Third Avenue, Pensnett Trading Estate, Kingswinford, West Midlands, DY6 7US, UK. Tel: +44 (0) 1384 275800 - If you need more information - Contact us.


The all metal casing shall be manufactured using pre-galvanised sheet steel suitably stiffened. Casings shall incorporate Ductmate flange connections at each end. Motor supports shall be of welded steel construction, painted black after fabrication.


Impellers shall be single inlet backward curved centrifugal type. Impellers are balanced to ISO 14694 Grade G6.3.


Highly efficient, maintenance free external rotor motors shall be used, matched to the aerodynamic performance of the impeller. These shall be protected to IP44 and suitable for speed control and working temperatures up to +50°C. Electrical connection shall be provided by an IP55 terminal box fitted onto the unit casing.

Quality Management

Units are to be designed and manufactured with procedures as defined in BS EN ISO 9001:2008. All SPD units are to be tested to ISO 5801:2007 (airside performance) and BS 848 Part 2:1985 (sound performance).

Typical Applications

Where higher pressure developments are required, such as:

  • Kitchen Canopies
  • Restaurants
  • Lift Motor Rooms
  • General HVAC Installations

Accessories & Wiring Data