.. my first visit to the site.
I'm thinking about replacing my 80% AFUE vertically vented natural gas furnace with a 95% horizontal vent.
Does the PVC vent pipe need to have a special HVAC rating or is standard schd. 40 acceptable?
I know the pipe needs to be pitched back to the furnace (to drain) and the intake and exhaust fittings need to have 12 inches of separation at their exterior termination.
What else do I need to consider ??