Less than 1 foot 300 mm above grade level.
High efficiency furnace exhaust distance to a door or window.
6 the distance from the bottom of an exhaust outlet to finished ground level or to any nearer and lower permanent horizontal surface shall be not less than 100 mm.
There are several other important aspects of high efficiency furnace venting.
The bottom of the vent terminal shall be located at least 12 inches above grade.
Other aspects of high efficiency furnace venting.
The vent terminal shall be at least 12 inches below 12 inches horizontally from or 12 inches above any door window or gravity air inlet into a building.
A high efficiency furnace uses a different type of venting system because it extracts the heat that remains in those combustion gases before venting the resultant mixture of water and carbon dioxide.
This high efficiency venting system must be installed when you install the new furnace.
The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process.
A conventional furnace vents these combustion gases through a vertical exhaust system that is attached to the furnace.
Forbidden locations for gas heater direct vent terminations the exhaust vent terminal shall not be located.