Galaxy In-Line Direct Driven Twin fans - GDD
At a Glance:
Represents the latest development from Vent-Axia in high performance, run and standby twin fans.
Specifically designed for horizontal mounting only.
Features external rotor motor and DIDW forward curved centrifugal impeller assemblies.
Manufacture controlled to BN EN ISO 9001.
Performance tested to BS848 Parts 1 & 2.
FAQ's Answered:
Optional positioned inlet spigot
Optional acoustic lining
Standard Thermal Overload Protection
Motor Insulation Class B
Maximum operating temperature 40°C
The GDD Galaxy In-line Direct Driven Twin fan range represents the latest development from Vent-Axia in high performance, run and standby twin fans. Designed to be controlled in conjunction 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 Heavy Gauge Galvanised Steel fitted with inlet and outlet spigots, with further optional inlet positions. Individual gravity return shutters are fitted as standard to prevent air re-circulation through the standby fan or system during shut down periods. Optional acoustic lined casings are available. The Galaxy In-Line Direct Driven Twin Fan range is specifically designed for horizontal mounting only. Assembly is controlled to BS EN ISO 9001.
All units are pre-wired to an IP44 terminal box, fitted to the outer casing to reduce installation time and cost. An optional IP65 service switch is available on request. Access to the fan section is via an easy to remove top access panel, for cleaning and maintenance during shut down periods. The Galaxy range is available in ten models with extract performance ranging from 0.067m³/s up to 1.488m³/s (201m³/h to 4820m³/h), with pressure characteristics of up 400Pa.
Motors / Impellers
Galaxy features external rotor motor and DIDW forward curved centrifugal impeller assemblies specifically chosen for performance. The assembly is dynamically balanced to ISO 1940 Grade G.6.3. Quality Class G.6.3. Ball bearings are greased for life and allow the fan to run at any angle. Insulation is Class B (from -15°C to + 40°C).
Electrical
All motors are single phase 230-240V 50 Hz. A terminal box is supplied with all models protected against dust and water jets from any angle. All motors are fitted with Standard Thermal Overload Protection (S.T.O.P.) by means of a thermal contact switch incorporated in the windings to prevent motor damage by overloading/overheating.
DIMENSIONS:
Unit | a | b | c | d | e | f | Weight kg |
GDD1X | 210 | 530 | 425 | 175 | 100 | 55 | 20 |
GDD2 | 260 | 740 | 525 | 225 | 150 | 55 | 20 |
GDD2X | 260 | 740 | 525 | 225 | 150 | 55 | 20 |
GDD2XH | 260 | 740 | 525 | 225 | 150 | 55 | 20 |
GDD3 | 330 | 740 | 600 | 250 | 150 | 90 | 20 |
GDD4S | 390 | 900 | 700 | 350 | 200 | 95 | 30 |
GDD4 | 390 | 900 | 700 | 350 | 200 | 95 | 30 |
GDD5 | 440 | 1000 | 800 | 400 | 325 | 57 | 52 |
GDD6 | 440 | 1000 | 800 | 450 | 350 | 44 | 59 |
GDD7 | 575 | 1250 | 1000 | 650 | 400 | 86 | 64 |

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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.

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

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)

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ESTIMATED RUNNING COSTS
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Overview
The GDD Galaxy In-line Direct Driven Twin fan range represents the latest development from Vent-Axia in high performance, run and standby twin fans. Designed to be controlled in conjunction 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 Heavy Gauge Galvanised Steel fitted with inlet and outlet spigots, with further optional inlet positions. Individual gravity return shutters are fitted as standard to prevent air re-circulation through the standby fan or system during shut down periods. Optional acoustic lined casings are available. The Galaxy In-Line Direct Driven Twin Fan range is specifically designed for horizontal mounting only. Assembly is controlled to BS EN ISO 9001.
All units are pre-wired to an IP44 terminal box, fitted to the outer casing to reduce installation time and cost. An optional IP65 service switch is available on request. Access to the fan section is via an easy to remove top access panel, for cleaning and maintenance during shut down periods. The Galaxy range is available in ten models with extract performance ranging from 0.067m³/s up to 1.488m³/s (201m³/h to 4820m³/h), with pressure characteristics of up 400Pa.
Motors / Impellers
Galaxy features external rotor motor and DIDW forward curved centrifugal impeller assemblies specifically chosen for performance. The assembly is dynamically balanced to ISO 1940 Grade G.6.3. Quality Class G.6.3. Ball bearings are greased for life and allow the fan to run at any angle. Insulation is Class B (from -15°C to + 40°C).
Electrical
All motors are single phase 230-240V 50 Hz. A terminal box is supplied with all models protected against dust and water jets from any angle. All motors are fitted with Standard Thermal Overload Protection (S.T.O.P.) by means of a thermal contact switch incorporated in the windings to prevent motor damage by overloading/overheating.
Technical
DIMENSIONS:
Unit | a | b | c | d | e | f | Weight kg |
GDD1X | 210 | 530 | 425 | 175 | 100 | 55 | 20 |
GDD2 | 260 | 740 | 525 | 225 | 150 | 55 | 20 |
GDD2X | 260 | 740 | 525 | 225 | 150 | 55 | 20 |
GDD2XH | 260 | 740 | 525 | 225 | 150 | 55 | 20 |
GDD3 | 330 | 740 | 600 | 250 | 150 | 90 | 20 |
GDD4S | 390 | 900 | 700 | 350 | 200 | 95 | 30 |
GDD4 | 390 | 900 | 700 | 350 | 200 | 95 | 30 |
GDD5 | 440 | 1000 | 800 | 400 | 325 | 57 | 52 |
GDD6 | 440 | 1000 | 800 | 450 | 350 | 44 | 59 |
GDD7 | 575 | 1250 | 1000 | 650 | 400 | 86 | 64 |
Accessories

Please click here for the latest product alternative
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.

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

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)
