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.
thermal insulated ventilation ducts  Maintain the temperature and heat loss of the air at the specified level when transporting warm air through long ventilation ducts. It is important you keep both criteria at desired level to minimise energy loss.