With out knowing the manufacturers installation Specs., what do you see wrong here? if anything. It just doesn’t look right having an 8" pipe out of the boiler only to be reduced to a 3" pipe connected to a fan.
The fan did not shut off the entire time of the inspection, even when the boiler did and the vent stayed very hot.
The house was originally built for/by a local HVAC company in 88’ and they have continued to service it through out the years. They are not the current selling owners.
Input is appreciated.