of Indoor Pools and Spas
ventilation is an aspect that needs to be considered in the
initial stages of a wet area in the design of a building.
the selection and implementation of natural ventilation equipment
to wet area enclosures an understanding of the dynamics involved
needs to be understood
is not that mechanical services should not be employed in establishing
the correct ventilation necessary, but more that they should
be a refinement to the theme and not the theme itself.
often one loses focus as to the purpose of venting a wet area.
two principle concerns are
precipitation & odour
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
spread of odour
created by varying forms of chlorination, mould etc.can also
contribute to a degree of discomfort throughout a building particularly
those of a residential situation where the natural inclination
is to close everything up when the building, or area, is unoccupied.
problem of odour can only be resolved by air washing (ventilating)
the area so as to offset any mould and mildew as might grow
as a consequence of moisture saturation in the building materials.
air volume exchange need to be proportional to the moisture
level in the air as well as temperature.
higher the temperature the greater the venting air flow. This
does not mean that the flow of air needs to be high velocity
but more higher volume
initial building design, careful consideration
as to the nature and character of the area ultimately determines
the necessary equipment required to establish the correct ventilation
dynamics deemed suitable
retro fitting, a complete and
accurate assessment of the existing dynamics is required before
the solution can be determined. This can be a costly affair
in contrast to the implementation of natural ventilation during
the initial building construction phase.
usually means that you'll end up chasing your tail because as
you resolve one issue, another takes it's place, as a consequence
of the ventilation solution employed in the first instance.
you throw your hands up and install a high velocity fan, in
the hope that it will resolve everything and when that reveals
itself to be less than ideal you'll put the house up for sale
ensure you do not resolve the problem by creating another problem.
It is fundamentally important
that wet areas are able to ventilate efficiently without dependency
on equipment such as de-humidifiers, fans, and / or other mechanical
services, particularly in commercial facilities, when the area
is not being used.
not presume the architect has the knowledge
required to resolve or address the aspect of ventilation in
a Swimming Pool / Spa enclosure as the dynamics are unique to
the individual area.
the concept of indoor bathing areas and the benefits to
be derived from them is taken for granted. Unfortunately the
necessity of ventilation is forgotten until all manner of problems
arise, particularly those of odour.
of building materials, due to excessive
moisture absorption is a common occurrence. The lack of appropriate
ventilation brings about costly repairs, which could have been
ventilation of enclosure design is paramount
in ensuring that the building provides the maximum benefits
whilst requiring minimal maintenance. Too much is made of trying
to have the swimming pool enclosure conform to the overall design
theme of the home without appropriate consideration to the essential
fundamentals as is required for wet areas, heated or otherwise.
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.
Flow venting is inefficient
and never appropriate for heated enclosures. Mechanical venting
such as exhaust fans are only capable extraction whilst on and
can never be as effective or cost efficient as an appropriate
drafts may be considered to be a form of ventilation they should
be avoided as their presence often promotes thermal shock giving
rise to colds and other respiratory problems.
one aspect that is continually overlooked is that ingress of
dust into any area is proportional to the air volume entering
This is why a natural balanced flow according to the needs of
the area should be understood rather than uncontrolled ingress
by any means.