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393870-2 Rev 0: 11.07.2018 BBV
Condensation/isolation
Isolation is necessary to safeguard thermal-, sonic- and fire considerations at the plant. Most often it is a
combination of these are due to isolate.
Reasons for thermal insulation of ventilation ducts are:
•
obtain good heat economy by limiting heat loss
•
achieve a specific outlet temperature of the ventilation air.
•
preventing condensation on either the inside or outside of the duct.
Heating costs reduced by preventing the heat supplied in ventilation air can be transferred to unheated
surroundings.
If the ducts are positioned in a cold
environment, such as in an attic, where the
temperature is significantly lower than the
ventilation air, there is a risk of condensation
inside the ducts. This can be prevented by
isolating the channel exterior. In this case, the
channel wall being diffusion and would
therefore insulate externally with a diffusion
material of mineral wool.
It can also be used insulation tubes (100 mm
mineral wool) with plastic diffusion barrier pulled over the ducts. The same applies to insulation of pipings
between the unit and diffusors, bringing the cooled air up to the rooms.
Note! Remember good overlap of diffusion barrier and tape all joints with duct tape.
Fresh air and exhaust duct should always be condensation insulated throughout its length.
Proper performance of the unit connection is especially important. Similarly, isolate all other ducts for
cold and uninsulated room.
In areas with extremely low winter temperatures, additional insulation must be used. Total insulation
thickness must be at least 100 mm.
