Ducting System - Genvex COMBI BLUELINE Installation Instructions Manual

Ducting System

To build an airtight and durable ducting system, we recom-
mend that the ducting system be made from spirally
flanged pipes using fittings with a rubber ring seal.
To keep the noise level from the unit satisfactorily low,
always mount silencers on the supply air and extract air
ducting systems between the unit and the first air intake
and extract valves.
To prevent the air intake and extract valves from generating
any noise, it is recommended that air speeds in the ducting
be kept sufficiently low.
Insulation of Ducts in Cold Spaces
To take advantage of the high heat recovery potential of the
unit (efficiency), it is necessary to insulate the ducts
properly.
10
Supply Air and Extract Air Ducts
To minimise heat loss from the ducting system in cold lofts,
insulate the supply air and extract air ducts with a minimum
of 100 mm insulation. If insulation form alternative (A) is
used, it is recommended that it takes the form of two lay-
ers of 50 mm lamella mats with paper or foil externally and
staggered joints between the two layers. If the ducts are
laid on the rafter foot, alternative B may be used. The insu-
lation must always be tightly packed around the ducts.
Fresh Air and Discharge Air Ducts
It is recommended that fresh air and discharge air ducts be
insulated with a minimum of 50 mm insulation followed by
aluminium foil. The fresh air duct is insulated to prevent
warm air in the loft from heating up the fresh air in the
summer.
To avoid condensation damage, make sure that the place
where the discharge air duct passes through the roof or the
gable end is sealed well.
When placing outdoor air and exhaust air hoods/gratings,
care must be taken not to short-circuit the two airflows,
thus causing exhaust air to avoid being sucked back in. It is
recommended that gratings be placed on the north or east
side of the house for optimal comfort in homes/ apart-
ments. Minimum distance: 3 or 1 meter depending on
orientation of the grates Ensure that the fresh air intake is
not affected by sun heating of roof and fresh air intake..
Please refer to drawing
Refer to your local distributor for guidance on national
insulation directives.
Duct insulation, alt. A
Incorrect duct insulation
Duct insulation, alt. B