What is the minimum clearance required on the control side of an excavation for floor furnace clearances?

The minimum clearance required on the control side of an excavation for floor furnace clearances is 18 inches. This dimension is established to ensure safe and efficient operation of the furnace, as well as proper maintenance access.

Having an 18-inch clearance allows sufficient space for air circulation, which is critical for the furnace's efficiency and safety. It also ensures that there is adequate room to access the controls and perform any necessary adjustments or repairs without obstruction. This requirement is designed to minimize risks associated with overheating or blockage that could lead to safety hazards.

Establishing a minimum clearance of 18 inches helps to conform to safety standards that promote the proper functioning of heating systems while ensuring that they can be operated and maintained safely.