311.3 (6) exception (3)(c)
Return-air inlets shall not be located within 10 feet (3048 mm) from an appliance firebox or draft diverter in the same enclosed room or confined space.
Here is a furnace in a closet with a return air grill located directly under the door to the closet. We have always treated this as a violation (less than 10' away from a firebox) unless the door to the closet has a gasket that seals it from the hallway.
Here you can see the gasket material.
I have always been skeptical of this code. In reading it I see that it says, "firebox or draft diverter in the same enclosed room or confined space" and that is not the case once the door is shut.
I am looking for opinions.
Return-air inlets shall not be located within 10 feet (3048 mm) from an appliance firebox or draft diverter in the same enclosed room or confined space.
Here is a furnace in a closet with a return air grill located directly under the door to the closet. We have always treated this as a violation (less than 10' away from a firebox) unless the door to the closet has a gasket that seals it from the hallway.
Here you can see the gasket material.
I have always been skeptical of this code. In reading it I see that it says, "firebox or draft diverter in the same enclosed room or confined space" and that is not the case once the door is shut.
I am looking for opinions.