You've probably heard the term but may not know the details. . . A Duct Blaster® is actually a registered trademark belonging to The Energy Conservatory™ for their marquee fan/manometer system, aka The Minneapolis Duct Blaster®. The Energy Conservatory™ has been diligent, at least in my experience, to defend their trademark from "genericide", however, IMHO it's likely to go the way of Kleenex, Aspirin, Escalator - all formerly trademarked product names that became too descriptive of the product losing the owners their protections. It's an interesting catch-22 for product manufacturers, you work to build a brand name, only to then defend it once it finally "becomes a household name." Can you believe "Heroin" was once a trademarked product?!
The test people are actually referring to is called Duct Leakage Testing which is now mandated all across the country, in one form or another, and the backbone of any worthwhile residential energy audit. It's the pressurized testing of a home's ducted air conditioning system for diagnostic purposes. The average house in the US reportedly leaks 25% or more - of the air just conditioned - outside the "building envelope". Duct Leakage Testing, and subsequent repairs, have the highest return on investment of any energy efficiency upgrade and are saving countless millions annually.
Compare to similar equipment by Retrotec, Ltd.
by clicking the image below. . .