How far must a door swing from an air inlet or outlet of a vented wall furnace?

The correct distance a door must swing from an air inlet or outlet of a vented wall furnace is 12 inches. This requirement is based on safety and operational standards. Ensuring that a door swings at least 12 inches away from these air inlets or outlets prevents the possibility of obstructing airflow, which is crucial for the efficient operation of the furnace.

If a door is too close, it could potentially block the flow of air needed for combustion or exhaust, leading to unsafe conditions or reduced efficiency. Therefore, maintaining this minimum clearance is essential to ensure that ventilation pathways remain unobstructed and that the heating system functions effectively.

This distance also aligns with common building codes and safety regulations, which often specify clearances around heating equipment to promote safe installation practices and to enhance the safety of the home’s environment.