This is a 3 year old bryant furnace installed on the 2nd level of a townhome.
I recommended an HVAC specialist for about 5 reasons.
1/ The serviceman switch wasnt functional due to the PVC flue being right on top of the switch.
2/ The PVC flue that vented through the roof wasnt properly connected at the roof flange.
3/ The filter access was poor at best. You have to remove 8 screws and then you may be able to remove the filter.
4/ Excesive noise in the cabinet. Sounded like the induced dratf fan.
5/ The pipe coming of the cold air return has an access panel cut in the kitchen but the pipe doesnt terminate anywhere.
The utility room has enough compustion air as the door is louvered & vented.
Why was this other vent added?
I pictured in order of the #'s