Just got a used Trane XR90. I need to know for the exhaust, can I connect the older connection or I have to make a new one. This older connection which is metal also has a T connection into it coming from the water heater exhaust. This connection eventually goes to the roof for outlet. Will I be ok with hooking XR90 to this metal outlet vent system.
Also for inlet air, do I need to have an outside connection or air in the basement is enough to handle the inlet requirements. House is 1200 sq. ft. and furnace is 60K BTU.