What is the minimum size required for a passageway servicing a water heater installed in an attic?

The minimum size required for a passageway servicing a water heater installed in an attic is 22 inches by 30 inches. This dimension ensures that there is sufficient space for safe and easy access to the water heater for maintenance and servicing.

A passageway of this size meets safety standards and is in accordance with building codes, which dictate that the passageway must be wide enough to allow an individual to navigate comfortably while carrying necessary tools and equipment. This is particularly important in the case of water heaters, as regular maintenance is essential for safe operation and to prevent issues like leaks or inefficient functioning.

Larger dimensions could provide more comfortable access, but the critical aspect is that 22 inches by 30 inches is the minimum that meets regulatory requirements for safe and practical access in an attic environment.