VIP+ is designed with an overlapping male-female joint. Lengths align easily and seal tightly at all connections. Each length includes an inner locking band which provides structural strength and holds the assembled parts together. The inner locking band also encapsulates the sealant required for a leak-free system. This connection method greatly reduces labor, especially on the horizontal portion of the installation.
Access to the inner locking band is made possible by a 6-inch gap in the outer casing; an outer band bridges the gap. Insulated systems include a strip of insulation which must be installed inside the outer band.
Every component that is in contact with the flue gasses has the inner and outer locking band pre-installed. For insulated systems, an additional insulation wrap is included to fill the void.