3 m
1 m
3 m
7
Subject to Technical Modifications of GES Energy Small and GES Energy Medium
Duct insulation, alt. A
Duct insulation, alt. B
Faulty duct insulation
Duct system
It is recommended that the duct system is executed in
spiral ducting connected with rubber ring seal fittings in
order to provide a leak-free and durable duct system.
To achieve a satisfactory low sound level from the unit,
sound locks must always be fitted to the supply and extract
duct system between the unit and the first supply and
extract fittings.
It is recommended that air speeds in the ducts are
dimensioned at sufficiently low level to prevent noise from
the supply and extract fittings.
When positioning fresh air and extract roof cowls/grills,
make sure the two air flows do not intercept, causing
escaping air to be drawn in again.
It is recommended that grills are placed on the north or
east side of the house to provide optimum comfort.
Minimum distance: 3 m between supply and exhaust air
Insulation of ducts in cold loft spaces
In order to exploit the unit’s high recovery potential
(efficiency), it is necessary to insulate the ducts correctly.
Genvex recommends as follows:
Supply and extract ducts:
To minimise heat losses from the duct system in cold loft
spaces, the supply and extract ducts must be insulated
with a minimum of 100 mm insulation. If insulation form
alternative A is used, it is recommended that it is executed
with two layers of 50 mm lamella mats with paper or foil
externally and with staggered joints between the two
layers. If the ducts are laid on the rafter foot, alternative B
may be used. The insulation must always be tightly packed
round the ducts.
Fresh air and escaping ducts in cold spaces:
It is recommended that fresh air and escaping ducts
are insulated with a minimum of 50 mm insulation. The
fresh air duct is insulated to prevent warm air in the loft in
summer from heating up the fresh air. Take care to seal the
termination where the escaping duct is led through the roof
or through the gable end, in order to avoid condensation
damage.
Refer to your local distributor for guidance on national
insulation directives.
