Residential Double Storey

Windtower Roof Ventilation Systems

Residential double Storey

Roof Ventilation for Double Story Dwellings

During the summer months a house absorbs incredible amounts of heat, more if the roof is a dark colour with the mean average being 68 degrees Celcius in the upper region

Condor Ventilation presenting summer conditions of the upper level of a two storey home
Condor Ventilation presenting the upper level of a two storey home


The roof area begins to build up pressure through the expansion of air much like a pressure cooker. This heat load will permeate into the building fabric, and store itself in the insulation, maintaining unbearable comfort levels on the top floor.

Double storey situations are worse than ground level because the combined heat load of the house ends up upstairs via the stairwell and stores itself in the rooms of the upper level. An efficient means of relief is needed so as to allow the heat to escape up, through the ceiling, and out the roof ventilator.

All houses, whether air conditioned or not, benefit considerably by having a Condor Kinetic whole house roof ventilation system installed. The savings on electricity alone is well worth the exercise, not to mention a healthier environment.

The most critical aspect of summer venting is night time purging. It is essential that the house shed it’s acquired heat load of the day and not carry any residual load into the next.

All Condor products are architectural in nature in that they are supplied project specific. Roof Ventilators are supplied as per roof type, pitch and profile enabling correct and efficient installation.

Condor Purge Vent

The Condor roof ventilator is used in both residential & commercial buildings and is the preferred design for most architectural projects due to it’s high performance, passive and motionless appearance.

Only one appropriately sized unit is required for a common void.

Selection – double story conventional square / rect. attic roof area.

  • 180 sq/m roof area Windtower 350
  • 210 sq/m roof area Windtower 450
  • 280 sq/m roof area Windtower 500

This is a general indication as to what is required in respect to roof ventilator sizes although different plan configurations need to be considered as regards to ingress and egress of the roof ventilation theme.

Variables to be considered, such as roof pitch and ducting of air conditioning along with roof colour and material. In a common roof area one large roof ventilator is  more efficient that multiple smaller.

Ceiling Purge vents are manually,from the floor using rod and claw, or electrically opened and closed as required This allows for efficient heat purging of an evening during summer and controls heat loss during winter months.

Condor ventilation detail of PP purge vent

The Condor Kinetic Windtower Roof Ventilator – the most efficient natural passive roof ventilator in the world today, has a 20 year warranty on construction and material.