Final answer:
The minimum distance that a vent from an appliance with an input of 10,000 BTU/h should be from a non-mechanical air supply is 3ft (C). This distance helps prevent exhaust gases from re-entering the building.
Step-by-step explanation:
The minimum distance that a vent from an appliance with an input of 10,000 BTU/h should be from a non-mechanical air supply is 3ft (C).
This is in accordance with the National Fuel Gas Code (NFPA 54) which specifies that vents should be a minimum of 3 feet from windows, doors, and other openings into buildings. This distance helps prevent exhaust gases from re-entering the building.
It's important to follow these safety guidelines to ensure proper ventilation and prevent any potential health hazards.