Air quality as well as temperature affects our health, particularly in the locations where we spend most of our time, such as in bedrooms.  One of the causes of poor air quality is mould. This develops from spores in the air which begin to grow once these spores land on moist surfaces. To prevent this, we need:

  1. Heat because warmer air can hold more water, so it’s not landing on the walls, and

  2. Ventilation to get the humid air out of the room.

Why not just open a window to ventilate?

  • When it's very cold outside people are unlikely to open the window and ventilate at all.

  • Other reasons for not opening windows include security concerns, pollution and insects.

  • Even if people reliably opened the window to ventilate twice a day, the amount of ventilation introduced will not be sufficient to last a night. Moisture builds up from simply breathing in a confined space like a bedroom

The ambiguity of how the mould began can cause expensive repair costs and legal issues. A tenant has to ventilate correctly and a landlord has to provide a building without defects, so that mould cannot easily appear. The problem is that if mould does appear, it is often first the landlord’s burden of proof that the building has no defects, and they also have to prove that the tenant did not ventilate correctly. Only then can they make a tenant pay for any damage occurred. It is much easier then to remove this bone of contention with controlled filtered ventilation. The landlord can sleep easy and the tenant more comfortably knowing that adequate heating and ventilation will not be an issue

Another issue indoors with poor ventilation is levels of high carbon dioxide. This can cause headaches, drowsiness, poor concentration and other symptoms.

Sojol has developed a range of products to address these issues.

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This elongated 300mm long wall-mounted fan draws in and filters up to 140m3/hr of outside air via a 100mm diameter duct. A double bedroom requires 60m3/hr ventilation and less for a single, while a living area of five people may require approximately 130m3/hr.

The fan is quiet which is especially important in bedrooms. Its uniquely streamline design causes very little resistance to air leading to low torque and a significantly reduced power consumption of about 5.3W.

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V2 and V3

V2 and V3 are all-seasons ventilation solutions with heating for the colder season. V2 is wall-mounted while V3 is ceiling-mounted. They quietly filter up to 140m3/hr outside air. When the temperature drops below a certain threshold, they switch to recycle and continue to heat air.

An optional vent under the heater passively allows stale air to be exhausted once V2 or V3 have positively pressurized the room. This optional vent can also be closed off to the outside depending on the outside temperature.

Their compact size makes them ideal for any room of the house.


V3 offers further choice with a ceiling-mounted ventilation solution and comes with wall-mounted controls.

The efficiency of heat exchange and the fans in V2 and V3 result in very low power consumption.


V1, V2 and V3 can be used in various combinations to provide thermal comfort and a healthier air quality. Where doors tend to be closed, such as bedroom doors, and in order to create a cross flow of ventilation at a comfortable temperature, V1 can be located above a bedroom door inside a bedroom for example. This draws through some of the heated fresh air from a location elsewhere.

Alternatively, V2 or V3 can be located in the bedrooms where heat is drawn into the living rooms by means of V1 and exhausted from the building such as via bathroom or kitchen fans.

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