Twinflow STDR
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The Twinflow STDR...EC incorporates the BAT (Best Available Technology) Vpro backward curved impeller, with three dimensional profiled blades powered by the ultra reliable Ziehl-Abegg EC (electronically commutated) external rotor motor. The range of twin roof fans are suitable for external mounting, manufactured in Aluzinc with a natural finish.

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Learn more about individual features and benefits of our products.

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The Twinflow STDR range of roof mounted fans as manufactured by Elta Fans Ltd.

Technical information


The technical information available to you from ELTA Fans is exhaustive - Choose from either sound, performance and electrical or dimensional data for each and every product



Elta supply a full range of accessories for each of their products.



Choose up to three products to compare their features side-by-side.



Get the full brochure, wiring diagrams and operation and maintenance instructions.

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Features & Benefits

Material Strength

This robust and durable unit has a casing manufactured from natural finish Aluzinc, with a louvred air discharge which provides protection against ingress from the elements and is self draining.

Ease of installation

All models are designed for direct connection to standard diameter flexible or rigid circular ducting with long spigots with EPDM rubber U shaped seals for ease of connection.


High efficiency low tonal noise backward curved centrifugal impellers are directly driven by an AC or EC external rotor motor, designed to be non-overloading and provide high performance characteristics.

Quality Assurance

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

Design Appeal

Ideal for external roof mounting applications where space is a premium.

Full Accessory Range

Speed controllers, fast clamps, silencers, flexible connectors and auto-changeover panels.


Each STDR has a 12 month warranty

SPP Specifications


The Twinflow STDR range of direct drive Twin 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 unit casing shall be manufactured from 1.2mm thick natural finish Aluzinc. The casing shall be designed so as to minimise vibration and shall incorporate a louvered air discharge guarded against bird ingress. Drain points shall also be provided. Each casing provides an inlet spigot to suit standard circular ducting. EPDM (Ethylene Propylene) rubber U shaped seals (being ozone and UV stable) are used to ensure a good seal back to the duct that is to be attached. Top access panels shall be provided for ease of servicing.


High efficiency low tonal noise backward curved centrifugal impeller, dynamically balanced to ISO 14694 Grade G6.3 and directly driven by the motor to provide a
 smooth airflow through the unit.


The Twin range of units may have either an EC or AC external rotor motor fitted as standard. The motor contains sealed for life bearings. Thermal Class of motors to THCL 130 or 155 dependent on size. Manufactured by Ziehl-Abegg providing increased reliability. All motors are suitable for use in ambient air conditions up to +60°C.

Quality Management

All units in the Elta range are designed and manufactured to procedures as defined in BS EN ISO 9001:2008. They are also tested in accordance with BS848 Part 2 1985 (sound performance) and ISO 5801:2007 (airside performance).

Typical Application

  • Industrial Building
  • Banks
  • Hospitals
  • Offices
  • Hotels and Shopping Malls
  • Flexible Connectors (018)

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  • Auto Changeover Controllers

    The control panel features a 2 position Fan 1 / Fan 2 rocker switch for fan selection.

    Read more

Accessories & Wiring Data

AC Motors



EC Motors