Well, I do the installation, service and in home estimates for a very large dealer and a small one.
Quite honestly, most units get loaded in a truck and we never hear anything about it. Most of these guys think they know everything and have no interest in a Dwyer. (co detectors come with the units)
All of my direct or power vent installs get a manometer. Period.
A large majority of chimney jobs get one too.
I'd love to have people ask about this stuff, an educated consumer is the best customer.
I will say that alot of dealers are very ignorant of this stuff however.