Roof Ventilators - A Comparison Study of
Rotary/Turbine to Condor Kinetic

Rotary/Turbine Type

Commercially developed in the United States in early 1900s to remove welding fumes in factories during the winter months. This is a predominantly winter ventilator.

Initial Conclusion

Rotary/turbine can best be referred as a Winter/Wind ventilator as it's efficiency is governed by wind speed which is predominant in the Autumn, Winter and Spring months, particularly at the change of seasons.
Highest efficiency according to wind velocity.

Rotary type will move a fixed volume of air (irrespective of temperature or season) dictated by wind velocity.

Where no free air (replacement volume) is available

Rotary/turbine type is dictated by availability of a replacement volume (free air).
Rotary/turbine type cannot displace what cannot be replaced.

Performance during cooler months

Rotary/turbine unit is suited to this period, however is deemed detrimental in residential applications as dry warmer air in roof is removed and replaced with ambient which has greater moisture levels.

Performance during warmer months

Rotary/ turbine type is not suited to this period. When no wind movement is available, the only way hot air can escape is by having to overcome the resistance created by the turbine rotor. It is therefore less efficient than a simple open unobstructed hole in the roof.

Multiple units are often required.

Re - Maintenance

Rotary/turbine type will require periodical maintenance and is inclined to be noisy.

Summary

There are no similarities between the two types as can be clearly observed.
The principles governing the mode of operation between the two products are almost total opposites.
Their selection as to purpose and use is dependent entirely on the task they are expected to perform.

Condor Kinetic Type

Initial product patent in Australia in late 1980s for removal of heat from buildings. This is a heat and pressure driven roof ventilator designed for summer conditions.

Initial Conclusion

Motionless Condor type can best be referred as a Summer/heat ventilator as it's efficiency is governed by heat pressure and internal thermal values along with external pressures.
Highest efficiency during Summer months according to temperature.

Motionless Condor Kinetic type will move a high volume during the Summer and low volume during Winter.
The Condor type is unsurpassed in zero wind velocity

Where no free air (replacement volume) is available

Condor Kinetic type is able to offer air volume exchange as dictated by pressure fluctuations both internal and external of the building. Put simply the Condor type allows the building to breathe in and out.

Performance during cooler months

Condor Kinetic mode of operation is not totally suited to this period. It is however, ideal in residential / institutional situations to ensure the dry air is not removed from roof cavity and replaced with external moist ambient.

Performance during warmer months

Condor Kinetic type was designed for and is well suited to this period. Distinct advantage in that only one correctly sized Condor is required for a
conventional residential roof, either tile or steel.

Only one correctly sized unit is recommended for residential dwellings

Re - Maintenance

Condor Kinetic type requires no maintenance and is noise free.

Research Study conducted by Industrial Design Company Man Made Pty Ltd.