Which of the following is NOT a requirement for intake opening location?

The correct answer, which indicates a requirement that is not associated with intake opening location, is the aspect of mandatory interlocking with appliances. In mechanical systems, particularly in ventilation and combustion applications, intake openings must adhere to specific standards to ensure safety and efficiency. These standards typically include the required distance from lot lines to prevent encroachment on neighboring properties and to ensure compliance with local zoning laws.

The height above the ground is crucial in preventing debris and water ingress, thereby protecting the integrity of the system and ensuring safe operation. Additionally, maintaining a safe distance from contaminant sources, such as exhaust vents or pollution-generating equipment, is essential to guarantee that the intake air remains clean and suitable for use.

Mandatory interlocking with appliances, however, is not a standard requirement for the location of intake openings. Instead, such interlocking may be related to safety features of specific equipment or systems but does not influence the physical placement of intake air openings. Therefore, option D stands out as the correct choice, as it does not pertain to the requirements for the location of intake openings.