Quietflow SQS DCV
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The Quietflow SQS...EC DCV 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 acoustically treated single in-line fans are suitable for Demand Control Ventilation via matching sensors.

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Learn more about individual features and benefits of our products.

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The Quietflow SQS DCV range of centrifugal 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.



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

SPP Features and Benefits

Features & Benefits

Design Appeal

Ideal for roof spaces and / or where space is at a premium.

Low Noise

Each unit is acoustically lined, therefore the breakout noise levels are low.

Ease of Installation

All models are designed for direct connection to standard diameter flexible or rigid circular ducting with 50 mm 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. 

Easy Maintenance

Access to the fan and motor is by an easily removable panel for maintenance when required. 

Material Strength

A robust, yet lightweight unit with a galvanised sheet steel casing treated internally with a Class O rated (BS 476 Parts 6 and 7) fire resistant acoustic foam lining with a fire resistant polymeric coating


Motor and Impeller manufactured by Ziehl-Abegg providing increased reliability.


Each unit is supplied with integral mounting brackets.

Motor Protection

All SQSDCV units have integral thermal overload protection which prevents the motor from overheating.

Tested To The Very Latest Standards

SQSDCV units are tested to ISO 5801:1997 (airside performance) and to BS 848 Pt 2:1985 (sound performance) at Elta Fans own test facility, meaning accurate, up to date information on performance and noise data that can be relied upon.

Demand Control

All units supplied with integral controls to provide automated ventilation based on customer requirements complete with remote human interface.
Click on the logo below to learn more about Demand Control Ventilation...

Quality Assurance

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

Full Accessory Range

Fast clamps, anti-vibration mounts, silencers, panel filters, and flexible connectors.


Each SQSDCV has a 12 month warranty.



SPP Specifications


The Quietflow DCV range of in-line single 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 - Visit demandcontrolventilation.com. Or contact us.


The robust 1.2mm galvanised mild steel sheet casing, is treated internally with a Class O rated (BS 476 Parts 6 and 7) fire resistant acoustic foam lining with a fire resistant polymeric coating. The wrap around folded casing is specially manufactured using integral motor mounting plates to provide additional rigidity for the casings.

Each casing provides spigots 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. A removable lid is provided as a standard feature to facilitate ease of maintenance and cleaning.


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 single range of units may have either an EC or AC single 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. Electrical connection shall be via an IP55 terminal box mounted on the side for easy customer connection.

Quality Management

Units are to be designed and manufactured with procedures as defined in BS EN ISO 9001:2008.

All SQS DCV units are to be tested to ISO 5801:2007 (airside performance) and BS 848 Part 2:1985 (sound performance).

Typical Application

  • Toilets
  • Bathrooms
  • Hotels
  • Schools
  • Colleges
  • Libraries
  • Flexible Connectors (018)

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  • Panel Filters (018)

    Filter access with removable panel

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Accessories & Wiring Data