Share 'Duct testing in a conditioned crawlspace'

Concerning duct testing in crawlspaces (this is for new houses for Energy Star, but will be the same for existing houses):I have a house on a conditioned crawl with ducts in that crawl.  There is an exterior hatchway into the crawl, and no intentional connection between the house and the crawl.  When performing a total duct leakage test, no problem, just open the hatch before the test.  When perf…