The Gamma Ultra Series of Mixed-Flow 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 9 sizes, extending from 250 to 630mm diameter.

Features

• Robust, lightweight construction.
• Choice of speeds available.
• Compact, low profile design.
• Designed for down flow or vertical exhaust applications.
• Shutters are 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.

Construction
Cowls are UV-stabilised plastic.
Impellers are Mixed-Flow design and made from high performance injection moulded composite material.
Steel components have a corrosion resistant finish.
Bird-mesh guards are fitted as standard to both downflow and vertical exhaust models.

Motor
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
Most three-phase units are fitted with 2-speed star/delta design motors

Testing
Air flow tests based on ISO5801
Noise tests based on ISO13347-3

The Gamma Ultra Series roof ventilators shall be the downflow exhaust type as designed and manufactured by Fantech Pty. Ltd and be of the model numbers shown on the schedule/drawings.
Impellers shall be made from high performance injection moulded composite material. They shall be Mixed-Flow design and driven by speed-controllable external rotor motors with integral thermal overload protection.
The cowl shall be of the downflow exhaust design and formed from plastic and/or fibreglass. Steel components are corrosion protected.
All performance data shall be for a complete assembled unit based on ISO5801 for air flow and ISO13347-3 for noise.