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The plant room is fully insulated and vapour sealed to pool room standards.
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No chemical fumes can leak into in the plant room air.
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Any fuel boiler located within the same area is fitted with a sealed balanced flue.
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The fresh air intake duct work is well insulated to prevent condensation on the cold duct.
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Any cold water pipes or storage tanks are well insulated.
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Any electrics located within the plant room are housed within a suitably sealed enclosure.
In this instance, part of the casing of the Heatstar may be seen to sweat during cold weather due to the close
proximity of cool fresh air within the unit, which is quite normal.
If the duct work is exposed to cold outside air, then it should be thermally insulated and a vapour proof foil used.
SUPPLY AIR DISCHARGE DUCTING :
UNDER FLOOR DUCTING :
The entry hole to the under floor supply air duct requires to be positioned to accurately match up with the
discharge hole on the base of the Heatstar.
Any duct work protruding from the entry hole should be cut back so that it is flush with the surrounding finished
floor or plinth level.
Note that the initial part of the under floor duct may be visible to the client via the fan viewing port on the unit
and, therefore, should be made to look presentable.
If a high ground water table exists, under floor ducting should not be used due to the risk of the duct flooding
and compromising the whole system. All under floor ducting should ideally be very well thermally insulated with
100mm of hard-board insulation.
At least one water drainage point should be provided in the duct to enable any water which accidentally enters
the duct via a hose etc. to be quickly removed.
OVERHEAD DUCTING :
If the duct work is exposed to cold outside air or positioned in an un-insulated roof space then it should be
thermally insulated with 100mm hard board insulation and a vapour proof foil used.
It is important to seal the overhead duct as well as possible to avoid pool room air leaking into the cold roof
space.
If there is to be both over head and under floor supply air duct work, then a manually adjustable damper should
be positioned in the over head duct work in order to balance the air flow through each.
FRESH AIR INLET & POOL AIR EXHAUST DUCTING :
Both the length and number of bends in the ducting supplying the Heatstar with fresh air, and the duct
exhausting the pool room air, should be kept to a minimum and should ideally not exceed 2m in length.
The grilles should be positioned to discourage air recirculation between the inlet and outlet. The duct openings to
outside should be protected with suitable weather grilles to prevent birds and insects from entering.
The discharged air should not be obstructed by hedges, fences or walls and a minimum clearance of 800mm
should be provided.
The fresh air intake should ideally be positioned at least 1800mm away from any boiler flue outlet and care
should be taken to avoid gases omitted from the boiler flue from entering the fresh air louvre.
The exhaust air grille should preferably not be positioned directly under bedroom windows or towards adjoining
properties to prevent noise intrusion.
If the pool room air can normally enter the plant room, then the fresh air intake duct should be thermally
insulated and vapour sealed to prevent condensation forming on the cold duct.
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