There is ice and condensation on the ducts above my ventilation unit – what is the cause?

Ice and condensation on the ducts above the ventilation unit are usually caused by incorrect or insufficient insulation of the ducts. When warm, moist air comes into contact with cold surfaces without adequate insulation, condensation can form and freeze into ice in cold environments. For correct insulation, the applicable installation instructions for the product must be followed. It is also recommended to contact the company that installed the system so they can inspect the installation and correct any faults.