What is the minimum distance that the vent from a 175,000 BTUH category 3 furnace may terminate from a door?

The minimum distance that the vent from a 175,000 BTUH category 3 furnace must terminate from a door is important for ensuring safety and compliance with installation codes. The correct answer indicates that the vent must be at least 3 feet away from any door. This distance is stipulated to prevent the potential for exhaust gases to be drawn back into the living space through the door opening when it is used, something that could pose a health risk due to the inhalation of hazardous fumes.

In the context of Furnace and Venting Regulations, ensuring a safe distance from doors and other openings helps mitigate the risks associated with venting systems, particularly for Category 3 appliances, which typically have specific requirements regarding vent configurations and clearances.

The other distances, while they may seem plausible, do not align with the standardized safety practices established for such equipment. Adhering to the minimum distance is crucial for operational efficiency and maintaining a safe environment in any residential or commercial setting.