What is the minimum height that a unit must be supported above grade?

The correct choice is based on the requirement that outdoor equipment, such as air conditioning units and other mechanical appliances, should be elevated above grade to protect against water exposure, which can lead to damage and compromise functionality. A minimum height of 2 inches is specified to ensure that drainage can occur, preventing water from pooling around the unit. This height is significant enough to mitigate risks related to flooding or standing water, which is especially important in areas prone to heavy rainfall or adverse weather conditions. The elevation also promotes better air circulation and access for maintenance.

This standard helps maintain operational efficiency and prolongs the lifespan of the equipment, aligning with best practices in mechanical installations. Ensuring that units are appropriately elevated is a fundamental aspect of proper installation in order to adhere to safety and code compliance.