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Roof Ventilation for Indoor Pool & Spa


Indoor Swimming Pool and Spa Ventilation

Natural ventilation, and in particular roof ventilation is an aspect that needs to be considered in the initial stages of wet area building design.

Natural ventilation is the only form of ventilation suitable for wet areas in that it it is continious and consumers no energy.

What ever other devices may be employed in the area, such as dehumidifiers etc, natural ventilation is critical

Before the selection and implementation of appropriate natural ventilation equipment, to wet area enclosures can be done, an understanding of the dynamics involved needs to be established

It is not that mechanical services should not be employed, however, they should be a refinement to the theme and not the theme itself.

The phenomena of indoor rain, known as moisture precipitation, is a situation brought about by the sharp contrast of thermal differentials within and outside the area, occurring principally of an evening during frost conditions being zero movement of air

The spread of odour created by varying forms of chlorination, mould etc.can also contribute to a degree of discomfort throughout a building

In initial building design, careful consideration as to the nature and or dynamics of the area ultimately determines the necessary equipment required to resolve the problem.

In retro fitting, a complete and accurate assessment of the existing dynamics is required

In conclusion, ensure you do not resolve the problem by creating another problem.
It is fundamentally important that wet areas are able to aspirate efficiently without dependancy on equipment such as de-humidifiers, fans, and / or other mechanical services, particularly in commercial facilities, when the area is not being used.

Do not presume the architect has the knowledge required to resolve or address the aspect of ventilation in a Swimming Pool / Spa enclosure.

Deterioration of building materials, due to excessive moisture absorption is a common occurance. The lack of appropriate ventilation brings about costly repairs, which could have been prevented.

Correct enclosure design is paramount in ensuring that the building provides the maximum benefits whilst requiring minimal maintenence.

Wet areas need continuous and effective ventilation, and in an appropriate manner. Fundamental to venting a pool enclosure is peripheral air entry 400 mm from ground level, and a central convergence of the air mass discharging to atmosphere. The higher the peripheral air ingress, the greater the incidence of moisture precipitation within the building, especially with a heated water mass.

Cross Flow venting is inefficient and never appropriate for heated pool enclosures.


Note in the diagram above, ideal air entry into a heated wet area enclosure should be within 300 - 400mm off ground level.

Whereas pool covers may be considered unsightly they are effective in reducing water heating costs whether solar assist is present or not

Condor Indoor Pool and Spa Ventilators


Requesting information about Condor products.

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.

The Condor Kinetic Cupola Roof Ventilator - is the most efficient roof ventilator in the world today