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Description
The Alpha Series of supply air roof units have been designed for use in free intake or ducted installations. These robust but lightweight units are fitted with bird mesh as standard to prevent debris and birds entering the building and interrupting motor operation. There are 10 models in the series extending from 200 to 630mm diameter.
Features
- Robust, corrosion-resistant construction with high performance axial flow impellers.
- Large choice of speeds available.
- The MV units have durable powder-coated steel blades. The AD/E units have GRP blades as standard with an option of aluminium, nylon or anti-static.
- Can be mounted at angles up to 30°.
- Some 3-phase motors are 2-speed star/delta design as standard.
- Speed-controllable using electronic or auto-transformer controllers.
- Robust, corrosion-resistant construction with high performance axial flow impellers.
- Large choice of speeds available.
- The MV units have durable powder-coated steel blades. The AD/E units have GRP blades as standard with an option of aluminium, nylon or anti-static.
- Can be mounted at angles up to 30°.
- Some 3-phase motors are 2-speed star/delta design as standard.
- Speed-controllable using electronic or auto-transformer controllers.
Construction
Cowls are of UV-stabilised plastic
Steel components have a corrosion resistant finish
MV units have powder-coated galvanised steel impellers
AD/E have GRP blades as standard with an option of aluminium, nylon or anti-static material where required
Bird-mesh guards are fitted as standard
Shutters cannot be fitted.
Motor
Type - MV - external rotor, squirrel cage induction motors
AD/E - squirrel cage induction motors
Electricity supply - 230V, single and 415V, 3-phase, 50Hz
Bearings - sealed-for-life, ball
Speed-controllable using electronic or auto-transformer controllers
Testing
Air flow tests to BS848:Part 1 1980
Noise tests to BS848:Part 2 1985
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| Speed [rps] | Avg. dBA @ 3m | kWatts (Input) | Amps | Max.°C | Approx. Weight [kg] |
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| 50 | 33 | 0.005 | 0.05 | 72 | 1.3 |
| Type | 63 | 125 | 250 | 500 | 1K | 2K | 4K | 8K |
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| Inlet | | 34 | 42 | 50 | 48 | 47 | 43 | |
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