What is the minimum duct insulation requirement for commercial ductwork in an unconditioned space within a building?

The minimum duct insulation requirement for commercial ductwork in an unconditioned space is R6. This requirement is established to help enhance energy efficiency and prevent heat loss or gain within the duct system. Proper insulation is crucial as it not only maintains the temperature of the air being transported but also reduces energy costs associated with heating and cooling.

Using R6 insulation ensures that ductwork is adequately protected from external temperature influences, thereby minimizing the risk of condensation and promoting better overall system performance. In unconditioned spaces such as attics or crawl spaces, where temperature fluctuations can occur, having ductwork properly insulated is essential to maintain the intended climate within the conditioned spaces of commercial buildings.