Just had a carrier 58cva 110 installed today in closed closet in condo. Prior furnace had 12" clearance in front. I am concerned that the new unit is much larger and only gives a clearance of 2" behind the wood door. Clearance of three inches from flue vent to wood door. Appears to be standard single wall flue pipe and is very hot to touch. The manual, by my reading, indicates 3" clearance to front of unit and 6" clearnace to single wall vent from combustibles. Installer said clearance of one inch is enough for both.
Do I have cause for concern?
Also, wonder if I have enough fresh air intake- only source to the utility closet is 8" fresh air vent ducted to somewhere in the house. Is there a simple way to calculate fresh air requirements? The closet is about 3' deep x 7'wide
Many thanks in advance for any advice folks can give. I can definitely get a second opinion on site if need be, but wanted to see if I have reason for concern first.