Residential HVAC Mythbusting

September/October 2011
A version of this article appears in the September/October 2011 issue of Home Energy Magazine.
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September 01, 2011
Two nagging duct questions answered
The idea was most likely born out of watching too many episodes of Mythbusters on the Discovery Channel, but it’s really about the scientific method: When you are presented with a set of supposed facts, put them to the test. In July 2010, Delta-T, Incorporated, a company that formerly specialized in duct sealing (over 5,000 systems sealed) but now focuses on consulting on large-scale utility HVAC programs, ran a series of tests to investigate the veracity of accepted beliefs on the subject of assembling residential ductwork. We carried out two separate experiments, designed to answer two nagging questions. First, what is the best way to connect sheet-metal duct to flex duct? And second, which parts of sheet-metal ductwork is it most beneficial to seal?

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