What is the minimum recommended clearance between the front of a gas furnace and the closet door where it is installed?

The minimum recommended clearance between the front of a gas furnace and the closet door where it is installed is typically four inches. This clearance is essential to ensure proper airflow around the furnace, which helps with combustion and prevents overheating. Adequate space allows for proper operation, maintenance access, and the efficient dissipation of heat emitted by the furnace.

Maintaining this clearance is also crucial for safety reasons, as it reduces the risk of the closet door obstructing the furnace’s operation. Inadequate space could lead to insufficient airflow, potentially causing the system to function poorly or even create hazardous situations. Codes and standards from organizations such as the National Fuel Gas Code support this minimum clearance to enhance performance and safety.