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Description
The Alpha & Beta Series of axial roof units are designed for a wide range of free intake and ducted exhaust air installations. These robust but lightweight exhaust units are available in
7 sizes in each range extending from 315 to 630mm diameter.
Features
Wide choice of speeds available.
All motors are speed-controllable.
Some 3-phase motors are 2-speed star/delta design.
Protective bird-mesh guards are fitted as standard on Alpha model unless fitted with optional shutters.
Shutters are fitted as standard to the Beta Series.
Robust, lightweight construction.
Can be used for free intake and ducted applications.
Can be mounted at angles up to 30°.
Supply air units can be supplied.
Wide choice of speeds available.
All motors are speed-controllable.
Some 3-phase motors are 2-speed star/delta design.
Protective bird-mesh guards are fitted as standard on Alpha model unless fitted with optional shutters.
Shutters are fitted as standard to the Beta Series.
Robust, lightweight construction.
Can be used for free intake and ducted applications.
Can be mounted at angles up to 30°.
Supply air units can be supplied.
Construction
Cowls are of UV-stabilised plastic or fibreglass.
Impeller blades are GRP as standard with an option of aluminium where required.
Metal components have a corrosion-resistant finish.
Shutters are fitted as standard to the beta series and are an optional extra on the Alpha series.
A bird-mesh guard is fitted on the Alpha model unless fitted with optional shutters.
Motor
Type - Squirrel cage induction motors
Electricity supply - 230V, single or 415V, 3-phase, 50Hz
Bearings- sealed-for-life, ball
Speed-controllable using electronic or auto-transformer controllers
Testing
Air flow testing to BS848:Part 1, 1980
Noise tests to BS848:Part 2, 1985
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