R-6 flex duct is a type of flexible ductwork that is used in heating, ventilation, and air conditioning (HVAC) systems to distribute air throughout a building or structure. R-6 flex duct is made of a flexible, lightweight material, such as PVC, metalized polyester, or fiberglass, and it is designed to be easily bent or shaped to fit around obstacles and through tight spaces.

The “R-6” designation refers to the insulation value of the flex duct, which is a measure of its resistance to heat flow. The higher the R-value, the greater the insulation value, and the better the flex duct is at retaining heat or cold. R-6 flex duct has an insulation value of R-6, which is considered to be a moderate level of insulation. It is typically used in residential and commercial HVAC systems to distribute cooled or heated air from the air conditioning system or furnace to the various rooms or zones of a building.

R-6 flex duct is commonly used in conjunction with other insulation materials, such as fiberglass batt insulation or spray foam insulation, to help improve the overall energy efficiency of the HVAC system. It is typically connected to the air handling unit or the furnace using a round connector, and it is attached to the registers or diffusers in the ceiling, walls, or floors to distribute the air throughout the space.

It is important to note that R-6 flex duct is not suitable for all applications, and it may not be as efficient at retaining heat or cold as other types of insulation materials. In addition, flex duct can be more prone to leaks and air loss than traditional, rigid ductwork, and it is important to properly install and maintain flex duct to ensure that it is functioning properly and efficiently.