Traditional
The manual construction of a pre-insulated Duct follows a standardised procedure. The process is the same regardless of the shape of the duct element; tracing, cutting, gluing, folding, taping, flanging and reinforcement; and sealing.
Tracing evolves using one of a number of many purpose made templates and scribing an outline.
Cutting and grooving is done with a variety of specially made jack planes
Glue is applied to all mitred surfaces with a curing time of 10-20 minutes.
The stages of the fabrication process are very labour intensive and time consuming, do not always give a good end product and create a great deal of waste material.
