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Thank Goodness For Duct Tape
You have to understand before I even begin that I am being facetious when I say thank goodness for duct tape.
From outside this house we saw a rather large vent covering on the front of the house.  It was rather ugly too, and damaged as if it had been hit by a fallen tree limb. 
Of course my client asked me what it was.  "A vent cap.  Likely a bathroom vent, but we will see once we get into the attic."
Little did we know what we would run into in the attic!
It was an older house, and both bathrooms had new vents.  And they both had new, wonderfully plastic vent tubes which met inside the one wide vent directing their air toward the attic penetration.
The smaller bathroom vent tubes each barely entered the wide tube.  So how much air was actually exhausting outdoors is minimal.
But the wide tube is not even directing the air toward the hole!
Fortunately, though, the tube is held in place (not the right place mind you, but in place) with DUCT TAPE!
And not that fancy, schmancy aluminum tape.
Actual DUCT TAPE!
It is not going anywhere!
Well, actually, I'm not ... more

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