Heated air is less dense than cold air, so houses tested in cold weather appear leakier than they really are (by about 1 percent for each 10 degrees F difference between indoor and outdoor temperature) unless an adjustment for temperature has been made. Otherwise, testing will indicate the amount of less dense air flowing through the blower door, and not the amount of colder, denser air flowing through the holes. From the Journal of Light Construction article: Blower Door Testing by David Keefe, January 2010 issue.
Equipment
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February 1, 2010
January 2, 2010
I bought two pressure pans last week from Energy Conservatory, one large for measuring duct leakage at supplies & returns and one small for measuring air leakage at outlets, switches and recessed lights. I am really looking forward to having these tools to better diagnose duct leakage. Here’s what Energy Conservatory has to say:
Pressure Pan
