Ventilation systems require thermal insulation in order to restrict and control heat loss. For financial and environmental reasons, it is important you reduce unnecessary heat loss in ducts that transport warm air. Ventilation ducts transport either warm or cold air. This, together with the temperature and moisture content of the surrounding air and in the duct, will influence your choice of insulation solution.
Prevent condensation easily by using the correct insulation solution. Apply insulation of the correct thickness to keep the insulation surface temperature higher than the ambient air temperature.