Duct Testing (aka Duct Leakage Testing) refers to testing the efficiency of your air delivery system, by measuring the amount of conditioned air your ducted A/C system leaks.  Estimates, at one time, had the average house in the US leaking 25%.  Current codes, including California's Title 24, now require less than 5% leakage.  That is a significant reduction, but how is it done? 

Pressurized fan systems, like the Duct Blaster® by the Energy Conservatory, are used to pressurize the duct system to quantify leakage to the outside, or total duct leakage.  Duct testing used to require applying disposable plastic tape over known openings (vents/grills, return air intake, etc...)  Vent Cap Systems™ are the patented, reusable alternative.  These reusable gasketed vent covers cut prep times in half - without the waste, expense, or hassle of tape and also allow you to seal vents remotely.  They're non-adhesive meaning they won't rip off paint or wallpaper.   Don't throw away wads of revenue after every inspection.  Start Making Green Faster!™