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This R-4.2 Insulated Duct Air Duct for HVAC Flex Ductwork Insulation - 25' Feet Long
is a type of insulated duct designed to be used in HVAC (Heating, Ventilation, and Air Conditioning) systems. It is 25 feet long and is made of flexible material that allows it to be easily installed in tight spaces and around corners.

This insulation used in this duct has an R-value of 4.2, which refers to its thermal resistance. The higher the R-value, the better the insulation's ability to resist heat transfer. An R-value of 4.2 is considered to be a moderate level of insulation, making this duct suitable for use in areas with moderate temperature fluctuations.

This flexible material used in this duct allows for easy installation in areas with tight spaces or complex shapes. This can help to reduce the need for additional fittings or connectors, which can reduce the overall cost of the system. Overall, this Insulated Duct R-4.2 Air Duct for HVAC Flex Ductwork Insulation - 25' Feet Long is a high-quality insulated duct that can help to improve the energy efficiency and performance of HVAC systems. Its flexible design and moderate insulation make it suitable for a wide range of applications, and it is a popular choice for both residential and commercial installations.

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