enervent eWind Series - Insulating Ventilation Ducts; Ventilation Duct Insulation Examples; Outside Air Duct (Fresh Air Duct); Supply Air Duct

11Installation instructions
EN
• The amount of silencers must be considered
case by case.
• We recommend that automatically closing
dampers are installed in outside and exhaust air
ducts.
• In case of a power failure, the dampers will
close and block out cold air, preventing any
water coil from freezing.
• If cold air gets into ventilation ducts, it will
create condensate when mixing with warm air.
NOTE: The ventilation ducts must be blanked
o until the ventilation system is taken into use.
This is in order to keep warm air from owing
into the duct. Warm air causes condensation if
it meets cold outside air or surfaces in the duct.
Furthermore the plugging keeps dirt and other
unwanted particles from clogging the system.
Insulating ventilation ducts
Insulate the ventilation ducts appropriately. This is
especially important when the ventilation unit comes
with a cooling functionality.
Ventilation ducts must be thermally insulated to
prevent water from condensing to the inner or external
duct surfaces in any circumstances. Additionally, the air
temperature must not decrease or increase excessively
in the ducts because of external factors. The ventilation
engineer calculates the insulation requirements
depending on the placement of the ducts and the air
temperatures.
Ventilation duct thermal insulation in heating use
Supply air duct from
the ventilation unit to
the supply valve.
The insulation must be designed
and implemented so that the
maximum air temperature change
in the duct is less than 1°C.
Extract air duct from
the extract valve to
the ventilation unit.
The insulation must be designed
and implemented so that the
maximum air temperature change
in the duct is less than 1°C.
Ventilation duct thermal insulation in cooling use
Supply air duct from
the ventilation unit
to the supply valve.
The insulation must be designed
and implemented so that the
maximum air temperature change
in the duct is less than 1°C. At least
19mm of cellular rubber insulation
on the duct surface.
Extract air duct from
the extract valve to
the ventilation unit.
The insulation must be designed
and implemented so that the
maximum air temperature change
in the duct is less than 1°C.
Ventilation duct insulation
examples
NOTE: Sound insulation is not taken into
account in these insulation instructions and
examples.
NOTE: Semi-warm space = +5°C - +15°C. A
semi-warm space refers also to dropped ceilings,
sub-oors, and casings.
Outside air duct (fresh air duct)
Cold spaces
• 100 mm of sheet, mat, or pipe-covering insulation
(plus the blown wool, when used).
Warm/semi-warm spaces, dropped ceilings, sub-
oors, and casings
• Option 1
• 80 mm insulation with vapour-proof external
surface.
• Option 2
• 20 mm of cellular rubber insulation on the
duct surface and 50 mm insulation with
vapour-proof external surface.
The insulation must prevent water vapour from
condensing to the external duct surface and excessive
air temperature rise during summer.
Supply air duct
Cold/semi-warm spaces and also by dropped
ceilings, sub-oors, and casings:
• In standard ventilation the insulation must be
designed and implemented so that the maximum
air temperature change in the duct is less than 1°C.
• For example, 100 mm of sheet, mat, or pipe-
covering insulation can be used (plus the blown
wool, when used).
Warm spaces
• Insulation is not required in standard ventilation.
In heating and cooling use see tables "Ventilation duct
thermal insulation in heating use" on page 11 and
"Ventilation duct thermal insulation in cooling use" on
page 11.