I have an 18 year old Lennox gas furnace that vents through a b-vent.
Also an 18 year old Bradford-White gas water heater that uses the same vent.
If I replace the furnace with a high efficiency model that vents through the wall:
The vent pvc pipe would be within 6 horizontal feet of the sliding glass door on the back (west) side of the house. Any chance that the exhaust gas would get into the house through the door? We use that door even in the winter.
Can the water heater continue to use the b-vent alone? Or would it not produce enough exhaust heat?