GRB - Galaxy Twin Roof Belt Driven Fans



The GRB Galaxy Roof Mounting Belt Driven Twin fan range represents the latest development from Vent-Axia in high performance, run and standby twin fan. Designed to be controlled inconjunction with Vent-Axia Trakmaster twin fan controller range, the total package offers the end user flexibility when interfaced with or without a (BMS) Building Management Systems, such as: manual selection; 12/24hr auto changeover ensuring the extended life of the fan and motor; night setback during low levels of occupancy, for energy management control during 24hr extraction.

The unit casing is manufactured from mill finished aluminium fitted with discharge aluminium weather louvre with bird mesh as standard. Assembly is controlled to BS EN ISO 9001.

Individual gravity return shutters are fitted as standard to prevent air recirculation through the standby fan or the system during shut down periods. Galaxy Roof Mounting Fans are only suitable for horizontal mounting. When installed on a shallow pitch roof a special upstand will needed to compensate for the angular difference – to be manufactured by others.

To meet COSHH requirements, double pole service isolator switches are fitted and pre-wired from the fans and mounted to the outer casing to reduce installation time and cost. Access to the fan section is via an easily removed top access panel for cleaning and maintenance during shut down periods.

The Galaxy range is available in four models with extract performance ranging from 0.02m³/s up to 2.5m³/s (720m³/h to 9000m³/h), with pressure characteristics of up 400Pa. All models are supplied with inlet spigots on the underside of the unit casing and an HET9TF discharge anodised aluminium weather louvre. End or side inlet spigot can be supplied as an optional extra.

Fan / Motor Assembly

Galaxy GRB belt driven fans are double inlet double width, forward curved centrifugal fans belt driven by totally enclosed fan ventilated motors, wound to suit 220-240V/1/50HZ or 380-415V/1/50Hz electrical supply. Protected to IP54, against dust and water jets complying withBS EN 60529.

Motor insulation is Class F as a minimum, suitable for operating temperatures up to +40°C. The fans and motors are mounted on a steel frame, with anti-vibration mounts between the frame and casing and a flexible connection between the fan scroll and fan plate, minimising vibration. All belt driven Galaxy units are supplied with metric pulleys to ISO 4183 and wedge belts to ISO 4184 and DIN 7753.


All Motors are available in either, single phase 220-240V 50 Hz capacitor start and run. Three phase 380V-415V 50Hz. The service isolator is supplied with all models with 20mm and PG11 entry, protected against dust and water jets from any angle.


Trackmaster Twin Fan Controller (ITC)
The ITC model provides automatic changeover on fan failure as well as enabling a manual selection of either fan for duty sharing or test purposes. (BMS compatible via volt free contacts). This controller must have a permanent live supply. Any On/Off switching must be via the sensor connections S1 and SG terminals.
Stock Ref No: 10314200


Trackmaster Twin Fan Controller (ITC-DS)
The ITC-DS model (Duty sharing). Incorporates a timing mechanism which operates alternate fans on 12 or 24 hour intervals, thus ensuring the extended life of the fan bearings. The controller also provides automatic changeover on fan failure along with the facility for manual selection of either fan. (BMS compatible via volt free contacts). This controller must have a permanent live supply. Any On/Off switching must be via the sensor connections S1 and SG terminals
Stock Ref No: 10314210
RSC - Remote Setback Control
The RSC multi-speed control system offers 2 speed fan versatility eg. Energy Management for night-time setback. Can be used in conjunction with Vent-Axia ITC, ITC-DS controllers using 5 step auto-transformer speed controllers for speed selection. Uses 24V output from ITC controller. Dimensions:86mm x 178mm x 100mm (Width x Height x Depth)
Stock Ref No: 10314230A
Remote Visual Indicator (RVC)
Wired in conjunction with either an ITC or ITC-DS controller the RVC can be located up to 100m away using low cost ELV wiring. The compact, single gang RVC ELV (Extra Low Voltage) remote visual controller indicates status of Fan 1 and Fan 2 with status/warning lights. Push button allows Fan 1 and Fan 2 with standby (Off) to be selected.
Stock Ref No: 10314220


Unit A B C D E F G H J Weight kg
GRB1 500 900 1100 900 500 250 247 100 900 90
GRB2 600 1150 1175 1120 762 305 150 27.5 1120 120
GRB3 700 1450 1450 1450 900 400 150 - 1450 195
GRB4 800 1550 1450 1550 1000 450 150 - 1450 215



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