The attic, crawl space, and an unfinished basement are all unconditioned spaces -- meaning you don't pay to heat and cool them. If you have ductwork in one of these areas, the duct temperature will be the same as the temperature of the space....
The laminate 10 of the invention can be attached to ductwork or other metal surfaces by known Clip-Pins sold by Duro Dyne National Corp. of Farmingdale, N.Y. These fasteners are resistance welded to the duct or metal surface by a special known welding process. Another possible fastener for ...