What is the approximate R-value for 1 inch of fiberglass duct wrap used to insulate round metal ducts?

Fiberglass duct wrap is a common insulating material used to enhance the energy efficiency of ductwork in HVAC systems. The R-value measures the thermal resistance of insulation, indicating its effectiveness in preventing heat loss or gain. For 1 inch of fiberglass duct wrap specifically used on round metal ducts, the R-value typically falls within the range of R-3 to R-4.

This R-value indicates that this amount of fiberglass insulation effectively reduces heat transfer, making it suitable for maintaining the temperature of conditioned air as it travels through ductwork. Using insulation with an appropriate R-value is crucial in preventing energy loss and ensuring the HVAC system operates efficiently.

In practice, selecting insulation with the correct R-value enhances the overall performance of the heating and cooling system. Therefore, the choice that aligns with the expected R-value for 1 inch of fiberglass duct wrap is indeed R-3 to R-4.