Installing or replacing HVAC ductwork in your home can be a headache. HV2 spiral ductwork is intended to reduce your concerns. The appearance of HV2 is clean. It is sealed at its connection points by internal rubber gaskets, not external tape and sealant. Best of all, HV2 requires less space than rectangular.
Spiral duct is pre-insulated with R8 8 ft sections on a 6 ft duct giving the contractor enough insulation to wrap the fitting
Gustafson HV2 Spiral Duct, High Velocity Self-Sealing, 10 in Diameter, 72 in Length, 26 ga