Twinflow STDRDCV400-1EC

Direct Drive Twin Centrifugal Fan

  • Standard size 400 mm
  • Air volume flow rates up to 0.962 m3/s
  • Static pressures up to 868 Pa
  • Suitable for operating temperatures up to +60℃
  • Available in EC


Roof mounted Aluzinc Twin centrifugal fans with demand control. Designed to monitor and control one or more fan units simultaneously, with 6 pre-programmed fan applications.

Features and Benefits

Easy Installation

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

Easy Commissioning

Minimum and maximum ventilation rates as well as control settings can all be setup easily via the wall display provided. Settings can be loaded from one display copying settings between units quickly.

Space Saving

External roof mounting, ideal where space is a premium. Bird guard fitted as standard to stop damage by wildlife.

Efficient Performance

High efficiency low tonal noise backward curved centrifugal impellers are directly driven by an EC external rotor motor, provide low specific fan powers and stepless speed control without tonal noise generation.

Weather Resistance

Integral louvered air discharge provides protection against ingress from the elements and is self draining. The unit has backdraught shutters fitted as standard.

Twin Fan Operation

Allowing control for Auto changeover and duty share.


Advanced control features provide an effective, efficient control to meet variable occupancy. This optimises the indoor air quality and energy use of the ventilation system. Available control, Humidity, Temperature, Presence, CO3 and Constant Pressure.


Each STDRDCV has a 12 month warranty.



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. Backdraught shutters shall be fitted as standard. Each casing provides an inlet spigot to suit standard circular ducting. Top access panels shall be provided for ease of servicing.


The Twin range of units shall haveEC external rotor motorsfitted as standard. The motors containsealed for life bearings. Thermal Class of motors to THCL 130 or 155 dependent on size. All motors are suitable for use in ambient air conditions up to +60 ℃.


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.


Electrical connection shall be via an IP55 terminal box mounted on the side for easy customer connection. Control shall be provided for applications Temperature, Relative Humidity, 0-10V, Constant Pressure and CO2 via separate sensor. Manual operation shall be provided by supplied LCD Display Unit. The unit shall incorporate pre-fitted in-duct temperature sensor for application Temperature without the requirement of a separate sensor. LCD Display shall allow adjustment of application parameters, operation of system automatically / manually and display of error messaging. Programmable time with four on / off functions per day shall be adjustable from the LCD Display Unit. Digital Input terminal connections shall be available for remote enable, fixed speed for boost speed or set back speed. Selection of Single, Twin and Master/ Slave fan arrangement shall be via LCD Display.

Quality Management

Units are tobe designed and manufactured with procedures as defined in BS EN ISO 9001. All Twinflow STDRDCV units are to be tested to ISO 5801 (airside performance) and BS 848 Part 2 (sound performance).

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