Sparky,
My Sister's up in NH and built a house about 10 yrs ago. We always kid them that they have to open a window to close a door. My brother-in-law asked if He could caulk the holes in the device boxes! I don't know if He did though.
My parent's house is in the same area and they had a real cold air coming down out of the 10 or 12 cans in the Kitchen because there was too much airflow in the Attic above. I can really see an application for airtite there. (But I mean a can without all the holes in it) They weren't available at the time though.
Bill
