Designed and manufactured in Australia for a harsh environment, the Hurricane is suited for industrial, commercial and community buildings, including schools, where its low starting torque provides ventilation for hot classrooms on virtually still days.

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• The Dynamics
• Effectiveness
• Placement & Design
• Fresh Air
• How to specify

The Dynamics of the Hurricane Turbine Ventilator

Heat and moisture in roof spaces affect personal comfort levels and the health of your working environment.

A well designed turbine ventilator, like the Hurricane, takes advantage of the wind to create a positive flow through the throat of the ventilator.

The wind influences the performance of the ventilator in two ways:

1. As the wind approaches and strikes the ventilator, it jumps, creating an area of low pressure on the leeward side of the turbine. This low pressure zone is fed by drawing air from the turbine, causing a continuous extraction of air from the building.

2. As the turbine rotates, the centripetal forces associated with the rotation fling air outwards from the tips of the vanes. Replacement air is drawn into the throat of the ventilator from the building causing continuous ventilation.

The Hurricane will even rotate and exhaust in the absence of wind using the thermal currents developed within the building.

The unique Tandaco Bearing System

The Hurricane incorporates the Tandaco double row heavy duty ball bearing system manufactured to perform for a lifetime in excess of the 15 year warranty.

It is secured into a nylon glass reinforced bearing holder with variable length buttresses designed to stabilise the turbine at all wind speeds.

The bearing is completely isolated from corrosive environmental conditions by its location between the dome and top diaphragm.

The Tandaco bearing is a precision ground spindle bearing 100mm long x 12 mm diameter with a double row ball bearing cage 30 mm in diameter.

The Hurricane's Vertical Vanes

As well as exhausting warm and stale air, ventilators must be weather proof which imposes influences on design that can be detrimental to their performance.

Vertical Vane design has distinct benefits over spherical turbines. They provide:

• Improved torque at low wind speed.
• Excellent protections against rain.
• Large exhaust opening.
• Positive locking to turbine ring.
• Greater "sail" area to drive the turbine.
  

Average Wind Velocities

During the hot months of November to March the daily recorded wind velocities in Australian capital cities exceed 6 to 10 km/hr for 96% of the hours between noon and 3pm.

NOTE: A wind speed of 6 to 10km/hr is defined as a light breeze. Wind is felt on the face, leaves rustle and vanes move by wind.

The average wind velocities for a 12 month period in km/hr are:
Sydney 12.5, Brisbane 10, Melbourne 13, Adelaide 14.4,
Perth 14.4, Darwin 9.8, Hobart 11.5, Canberra 6.4. (Source : Bureau of Meteorology).

Effectiveness

An efficient means of extracting warm and stale air through roof mounted ventilators.

Adequate low level provision for the entry of fresh air at ambient temperature.

The ventilators must be calibrated so that a nominated number  of air changes per hour can be provided.

No ventilation	Minimum  ventilation	Good ventilation
Absence of roof ventilators prevents hot and stale air escaping building.	Poorly designed ridge ventilators do not promote adequate ventilation or air movement in building	Efficient turbine ventilators exhaust hot and stale air and provide a given number of air changes per hour for the building.

Placement & Design

As a general rule hot or stale air will not exhaust through an opening into which wind can blow. Therefore ventilators which allow wind to enter because of poor design or location on the roof cannot be expected to exhaust because they backdraft, see figures A,B and C.

Elevated or raised ridge cap.	Poorly designed ridge ventilator.	Slope mounted ventilator.
Receives no assistance from the wind. Backdrafts restrict flow of air from building.	Usually not calibrated and have similar problems to raised ridge cap. Design can allow entry of rain.	Backdraft when located on windward side of building. Receive minimum assistance from the wind.

Fresh Air

Heat and moisture in roof spaces affect personal comfort levels and the health of working environment.

Many authoritative scientific studies have confirmed that people's productivity in the workplace is directly affected by air conditions. Fresh air makes people feel more alive and alert while warm, stale air causes people to feel lethargic and disinterested.

Yet many factories, warehouses, workshops and even community building are constructed without an efficient natural ventilation system - a system which would allow an adequate level of air movement in order to keep the occupants comfortable.

Introducing the Hurricane Turbine Ventilator

The installation of Hurricane Turbine Roof Ventilators will provide an efficient and cost effective system of natural ventilation.

Designed and manufactured in Australia for a harsh environment, the Hurricane is suited for industrial, commercial and community buildings, including schools, where its low starting torque provides ventilation for hot classrooms on virtually still days.

15 Year Warranty

Manufactured from corrosion resistant aluminium, the Hurricane has been tested by Construction Research Laboratory Inc., Miami, Florida and withstood a continuous gusting wind of 240km/hr without damage.

It has also passed the requirements of the Low Speed Dynamic Rain Penetration Test (3L/M at 57.4km/hr) and is now supported by a 15 year warranty.

Hurricane Turbine Ventilators improve the working environment

The wind-driven Hurricane ventilator exhausts hot, stale air from buildings and allows it to be replaced at low level with fresh air at ambient temperature. The result, naturally, is a much more pleasant working environment.

The Hurricane has other benefits too. It prevents condensation by exhausting moist air. And, in case of fire, it plays a safety role by exhausting smoke and fumes from the building.

The Hurricane Turbine Ventilator Offers

• All aluminium construction.
• A varipitch base that suits all roof slopes to 45 Degree or ridge mounting base available.
• The Tandaco prepacked double row ball bearing system.
• Vertical vanes for improved starting torque.
• Powder coating in most popular roofing colours.
• Ease of fixing to new and existing roofs.
• Nine throat sizes for cost efficiencies.
• Cord or remote control operated dampers.
• A 15 year performance warranty.

How to specify the Hurricane?

For information on how to specify the Hurricane <click here>