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Plastic ducts have been installed to carry the air to and from each room. Sealant has
been applied at all joints to make sure that no air leaks occur. The ducts are supported
where appropriate. Duct runs are optimised to the shortest overall length. All ducts
exposed in the attic are thermally insulated in order to (i) eliminate the possibility of
condensation happening inside or outside of the ducts and (ii) avoid heat losses to the
attic. The number of bends has been minimized. Similarly the use of flexible ducting is
minimized to less than5% of the total installation so as provide an internal surface that
is as smooth as possible thereby minimizing air flow resistance. Silencers are installed
as the final connections to the AHU to eliminate noise from the fans reaching the
rooms via the ducts
.
In each room you will find a delivery or
extract terminal as shown in Figure 4. These
terminals have an adjustable centre disc
which we use to control air-flow and balance
the system. Your system has been tested &
balanced by our technicians and needs no
further adjustment. These terminals should
not be adjusted in any way as to do so will
impede the effective operation of the entire
system.
Figure 4
The system is designed, to fully ventilate the house without opening any windows
during the heating season (anytime the external temperature is below 14°C). Below
this temperature, your heating system, if properly controlled, will come on at a low
level and will not appreciate the ingress of cold air through an open window. Above
this temperature, when there will be no heating demand it is human nature to open
doors and windows. At this point, your supply fan will go off automatically and start
again when the outside temperature drops.
There are two advantages to this, a saving on fan power and a summer bypass
arrangement whereby cool air is being drawn through open windows and exhausted as
normal from the wet area
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