Industrial Roof Ventilation-Passive Ventilation

Industrial roof ventilators for passive ventilation come in many different shapes and sizes and are suitable for most factory, warehouse and maintenance facilities to name a few.

A traditional passive roof ventilator sits on the ridge of a roof as this is the highest point of the roof and the optimal position to exhaust the warm buoyant internal air. The following image shows the basics of passive ventilation airflow:

industrial ventilation reduced image

Inlet air also know as make up air must be allowed to flow into the building, ideally at low level to replace the warm buoyant air that is expelled through the roof vent, thus creating airflow.

New buildings can be designed to accommodate ridge mounted ventilators quite easily. This is not quite as easy on retro fit schemes as the ridge purlins are generally too close together to make a ridge vent viable. The solution in these cases is to use a slope or pitch mounted ventilator, basically a ridge ventilator with slightly different flashing that allow them to be mounted down the slope. The optimal position for a slope mounted ventilator is as close to the ridge or highest point of the roof as possible

Roof vents can be manufactured from zincalume, Colorbond, galvanised steel or aluminium and can include automatic dampers to regulate the airflow during cooler months.

The size and quantity of ventilators required depends on many factors:

  • Size of building- Height x Width x Length
  • Heat load within the building – Machinery, personnel, etc.
  • Building fabric- Concrete, steel and is it insulated
  • Required air changes per hour AC/Hr

Passive ventilation can be a cost effect way of ventilating a building providing the system is designed correctly.

For more information and to request a free survey pleas contact us.

New Build Dwelling High level Window Automation

We were approached by Bespoke developer Woodford Homes to provide a solution for opening high level windows in a new build home they were constructing. Woodford Homes initial thoughts were to have manual winding gear to operate the windows, BlueSquared costed both manual winding and also Electric chain actuator systems as a comparison. The Electric option was more cost effective and subsequently chosen


The system comprised of 4No. SECO N 24 25 24v DC 250mm stroke 250N Chain Actuators along with a 3A 24v DC transformer with integral touch sensitive switch fascia. As the dry lining had not yet been installed it was a simple task for the site electrician to install the 2 core field cabling to the actuators from the switch and run a mains power feed to the switch.

Window | Facade Automation - 24v DC 3A Fascia Switched Transformer for Window Automation . . . $390.00 + GSTSECO N 24 25 24v DC Chain Actuator 0-250mm & 0-350mm



Optimise Air Quality in Buildings

Natural Ventilation in Buildings can be created by the use of automated facade/window opening. Internal air quality can be vastly improved, replacing stagnant air with fresh outdoor air, reducing the build up of CO2 while cooling down the fabric of the building at the same time. All creating a healthier and more productive working environment.

Introducing passive ventilation through the automation of facade windows or roof ventilation can optimise indoor air quality. Automated facade automation controls such as the NVLogiQ room controller and NV PSU can automatically operate the opening of facade awning window via electric chain actuator motors. The NVLogiQ controller monitors the internal CO2 and temperature along with external temperature and weather conditions such as wind and rain to optimise the benefits to the buildings occupants.

Passive Smoke Ventilation

Passive smoke ventilation allows the natural buoyancy of warm/hot air to free a building of deadly smoke build up. High level windows or vents in the facade or on the roof are opened upon activation by either independent smoke detectors, Fire alarm system or manual activation. Hot smoke that is starting to rise and build up in the higher levels of the building is released through the open vents. To enable this type of system to work effectively, an equal amount of make up or inlet air is required to be let into the building to replace the volume of expelled smoke laden air. The optimal location for inlet/make up air is as low as practically possible to ground level. This is where the ambient air is coolest and will start to fill the building with cleaner air.

Removal of the deadly smoke from a building allows the occupants a safer passage to exit, while also allowing the firefighting personnel to assess and fight the fire more easily.

BlueSquared offer a full range of EN12101 tested and compliant actuators and controls that can operate on a stand alone basis or through integration with fire alarm panels.