According to the IRC, what is the minimum width for a forced air furnace room passageway?

The minimum width for a forced air furnace room passageway is established by the International Residential Code (IRC), which specifies that a passageway should be at least 24 inches wide. This requirement is in place to ensure adequate access for maintenance, repairs, and safety, allowing technicians to work comfortably and perform necessary tasks without obstruction. A width of 24 inches provides enough space for movement, tools, and equipment, facilitating easy access to the furnace.

Other widths, such as those suggested by the other choices, do not meet the requirements set forth in the IRC for safe and effective access to furnace areas. A passageway narrower than 24 inches would likely hinder access, making it difficult for professionals to maneuver and potentially compromising safety during maintenance activities.