Direct vent fireplace clearance

So I have been given conflicting information on the termination of this fireplace vent. My understanding, per manufacture installation guidelines, direct vents through the roof have specific clearance requirements depending on the pitch of the roof. Additionally it has to be a certain distance away from vented soffits. The home I did yesterday is very close to not meeting the guidelines that I have found. But Another home inspector is telling me that this type of vent cap, a star vent cap, does not provide fresh air intake to this fireplace and it requires less clearance. I am not familiar with this type of vent cap. It is a sealed fireplace and I didn’t see a fresh air intake anywhere else. Anyone have any input on the type of cap and clearance on this thing? TIAimage image

The manufacturers installation instructions trumps the home inspectors opinion.