For none fuel gas appliances under floors shall have a minimum access point of ____ x _____ for appliance access.

• A. 12 x 12
• B. 24 x 24
• C. 30 x 30
• D. 36 x 36

Answer: (C)

Access for appliances installed under a floor must be large enough to pull the unit out and service it without removing the floor or other structure. The standard minimum opening is 30 inches by 30 inches because this size gives enough room for a technician to maneuver around and behind the appliance, reach the gas shutoff and connections, and bring in tools and replacement parts through the opening. Smaller openings simply don’t provide enough clearance to perform safe removal, disconnecting of lines, or maintenance. A 36 by 36 opening would be larger than needed in most cases, and isn’t required by the standard.