Why is air quality so important?

Healthy buildings should be like healthy lungs taking in oxygen rich air and exhaling carbon dioxide.

Inadequate ventilation and poor air quality lead to 'Sick Building Syndrome' (SBS) which affects people's well being and reduces the life of a building - all costing money. SBS describes symptoms of fatigue, sneezing, dizziness, headaches and eye irritation. A key indicator of SBS is that people's symptoms mysteriously ease once they have left the building.

Branz controlled study in 1987 by Robert C. Bishop on Ventilation to reduce indoor condensation.

Branz controlled study in 1987 by Robert C. Bishop on Ventilation to reduce indoor condensation.


The importance of ventilation

  • Mould and microbial organisms that cause allergies, eye and skin irritations and other health issues

  • High levels of Carbon Dioxide (CO2) indicative of poor ventilation, lead to drowsiness and lack of productivity

  • VOCs including formaldehyde are released from adhesives, upholstery, cleaning agents, carpeting, etc. and can cause health issues. These are most commonly found in newly renovated or new buildings.


Generally about 26 m3/hr of fresh air ventilation per person is recommended in order to enhance indoor air quality.

Robert C. Bishop from BRANZ in NZ carried out a controlled study in 1987 on Ventilation to reduce indoor condensation. Condensation leads to mold growth, one of the major causes of SBS. He demonstrated the close relationship between 1) heating and 2) number of air changes in reducing condensation in an insulated house. The house modeled was a single storey 10m*10m house with 20m2 of windows.

The lines on the graph above represent three locations in the house (wall, wall corner and single glazed window). When the conditions in the house lie on or below the lines, condensation begins to form. This graph reveals the critical importance of ventilation and some misconceptions that heating and insulation will solve the problem since these are only part of the solution. A lot of heating is not enough to prevent condensation if there is inadequate ventilation. As shown on the left side of the graph, 6000 watts is still not enough when the number of air changes is less than half. And also it shows at the right side of the graph that not a lot of heating is needed if there is sufficient ventilation. Assuming a double glazed window would align more closely with the wall and wall corner lines in terms of the formation of condensation, as compared to single glazed window, condensation would be prevented in the home with 1.5 air changes and only about 1000 watts when the ambient is below 10C.

Sojol’s solar air heater/cooler is capable of supplying over 800m3/hr.  This means it can supply more than double the number of air changes per hour to an average 3-bedroom home.


Fresh air ventilation

Inadequate ventilation leads to 'Sick Building Syndrome' (SBS) which affects people's well being and reduces the life of a building - all costing money.  A key indicator of SBS is that people's symptoms, such as fatigue or sneezing, mysteriously ease once they have left the building.

Ventilation with Heat Exchange

The growing trend in the building industry is towards excellent insulation to retain heat. Controlled fresh air ventilation is required to meet minimum ventilation standards to avoid health issues from stale moist air. Sojol's V2 and V3 heat exchange optimizes the rate of heat transfer.

Solar Heating and Ventilation

Internal heating accounts for about a third of total power costs in temperate climates.  Power savings from using solar energy pays for the cost of the solar air heater and in time, will be completely free. This significantly reduces power bills and protects from electricity price increases.

Innovative Technology

Sojol is a startup company with globally new and innovative technologies to lessen our environmental footprint, all protected by international patents. Our firm gives you a wholistic approach to heating, cooling and ventilation, so your company can get the best competitive advantage.

Solar Cooling and Ventilation

Cooling can be very expensive in hot climates when standard heat pumps can struggle to keep up. Sojol’s solar ventilator can provide the necessary cooling required as a solar chimney in temperate climates. Alternatively Sojol’s indirect evaporative cooling or newly designed heat pump that uses significantly less power can supply 100% cool fresh air.

Innovative fan Technology

Fan types and performance depend on different requirements and applications. Sojol’s innovative fan technology introduces a totally new fan design that opens up new applications promising greater efficiencies of power use and scope. Initial test results are exceptional.

Summary of benefits of Sojol's ventilation with or without heating (V1-V3)

  • Quiet

  • Filtered ventilation in any season

  • Efficient heat transfer to air flow as required

Summary of benefits of Sojol's solar ventilation

  • Fresh air supply in all seasons

  • A healthier internal environment leading to a greater sense of well-being

  • Large flow capacity to meet ventilation requirements

  • Intelligent control system ensures thermal comfort at all times

  • Directly solar heating air with Sojol's solar ventilator is more than 5 times as efficient as indirectly heating air using solar panels (based on 17% conversion rate)

  • Rapid payback in renewable energy savings

Summary of benefits of Sojol's indirect evaporative cooler

  • Inexpensive to cool air or replace wetted pads

  • Economic use of water

  • Separation of working and supply air so water can be recycled without purification

  • Proven efficiency of heating/cooling transfer

  • Large surface area over which the air can travel and evaporate the water.

  • Good volume of flow over the wetted surface.

  • Easily accessible washable pads

  • When combined with solar air heating, no need for dehumidification or humidification of supply air.

  • Compact

Summary of benefits of Sojol's newly designed heat pump

  • Uses R290 refrigerant with zero global cooling impact

  • Proven efficiency of heating/cooling transfer

  • Significantly cheaper to run

  • Compact

  • Easily maintained

Summary of benefits of Sojol's helical fan

  • Significantly improved volume of air delivered

  • Significantly improved pressure

  • Versatility of flow path