What is the minimum distance for a contaminated opening from a source located within 10 feet?

The correct choice reflects the standard safety practices in HVAC systems, particularly regarding the distance required to minimize contamination from potential sources. Maintaining a minimum distance of 2 feet from contaminated openings is essential to ensure that harmful substances, pollutants, or other contaminants do not enter the HVAC system or affect the indoor air quality.

This distance helps to mitigate the risk of airborne contaminants traveling into spaces where they can adversely affect human health or interfere with the performance and efficiency of the HVAC system. By adhering to established guidelines, HVAC professionals can better protect occupants and maintain system integrity.

It's valuable to note that some standards may recommend different distances depending on the specific setup or local regulations; however, 2 feet is widely recognized in many industry scenarios as a safe distance to provide an effective barrier against contamination when a source is located nearby.