How many inches above adjoining grade must grade-level equipment and appliances be supported or suspended?

The correct answer to the question regarding how many inches above adjoining grade grade-level equipment and appliances must be supported or suspended is six inches. This requirement is based on safety and functionality, ensuring that equipment is not adversely affected by water accumulation, debris, or other environmental factors that could impact their operation.

By elevating grade-level equipment and appliances at least six inches above grade, you reduce the risk of water ingress, especially during rain or flooding conditions. This also helps in maintaining adequate airflow and prevents the potential for rust and corrosion of the equipment, extending its operational lifespan.

In addition, local building codes and regulations typically incorporate this standard to promote uniformity and safety across installations. Following this guideline is crucial for HVAC professionals to ensure compliance with safety protocols and to deliver effective installations for clients.