What is the minimum horizontal distance a vent terminal should be from an opening unless it is elevated?

The minimum horizontal distance a vent terminal should be from an opening is 10 feet when it is not elevated. This guideline is established to ensure safety and prevent potential hazards associated with the venting of gases, such as carbon monoxide, that could enter a building through windows, doors, or other openings. By maintaining this distance, the risk of harmful gases affecting indoor air quality is significantly reduced, ensuring a safer environment for occupants.

Other options presented reflect incorrect distances that do not align with established standards, which could lead to improper venting practices and create health and safety concerns. Therefore, adhering to the 10-foot requirement is crucial for effective venting and protection against hazardous gas exposure.