A fuel-burning water heater is to be installed in a closet within a bathroom. According to Section 504.1, which of the following is NOT required for this installation?

• The closet to be for the exclusive use of the water heater.
• Combustion air obtained from the outdoors.
• A listed self-closing device on the closet door.
• The gasketing material to be from the published listings of the door manufacturer.