Gamma Downflow Series – CD718D

The Gamma Series of centrifugal roof units has been designed for use in commercial ducted exhaust applications. These compact and low profile units are fitted with birdmesh to prevent the entry of birds and vermin into the ducting or building. They are available in 12 sizes, extending from 192 to 710mm diameter.

Features

Robust, lightweight construction.

Choice of speeds available.

Compact, low profile design.

Designed for down flow exhaust applications.

Twin vertical discharge fan also available. Provides 100% standby capacity.

Shutters are standard on twin fan units and an optional extra for single fan units. The pressure loss across the shutter has to be added to the system pressure before making selections.

Can be mounted at angle up to 30°.

Most 3-phase motors are 2-speed star/delta design.

Supply air units can be supplied

Construction
Cowls are UV-stabilised plastic.
Impellers are backward-curved centrifugal design and can be plastic, steel or aluminium.
Steel components have a corrosion resistant finish.
Bird-mesh guards are fitted as standard to both downflow and vertical exhaust models.

Motors
Type - external rotor, squirrel cage induction motor
Electricity supply - 230V, single and 415V, three-phase, 50Hz
Bearings - sealed-for-life, ball
Speed-controllable using electronic or auto-transformer controllers (except CE316)
Most three-phase units are fitted with 2-speed star/delta design motors

Internal Thermal Protection
Thermal protection is supplied as standard on all motors.

Testing
Air flow tests to ISO5801:2007
Noise tests to BS848:Part 2, 1985