What is the minimum insulation requirement for ducts carrying ventilation air?

For ducts that carry ventilation air, the minimum insulation requirement is R-12. This level of insulation is important because it helps maintain the temperature of the air being transported and reduces energy loss. Proper insulation is crucial for ensuring the efficiency of heating and cooling systems, as it minimizes thermal bridging where heat can escape in the winter or enter during the summer.

R-12 insulation ensures that ducts are adequately protected from external temperatures, which is particularly important in climate conditions where temperature variations can significantly affect energy consumption and system performance. Insulating to this level also contributes to a more stable indoor environment by maintaining consistent air temperature, enhancing comfort levels within conditioned spaces.

The other insulation values are higher than necessary for this application, which could lead to excessive costs and potential over-insulation issues without providing additional benefits.