The minimum room volume multiplier for boilers not listed for closet or alcove installation is 16 times the boiler volume. If the boiler volume is 1 cubic foot, the minimum room volume is at least how many cubic feet?

• A. 8 cu ft
• B. 12 cu ft
• C. 16 cu ft
• D. 20 cu ft

Answer: (C)

For boilers not listed for closet or alcove installations, you must have a minimum room volume equal to 16 times the boiler’s volume. With a boiler occupying 1 cubic foot, multiply by 16 to get a minimum room volume of 16 cubic feet. Therefore, 8 and 12 cubic feet are too small to meet the requirement, while 20 cubic feet is larger than needed but still satisfies the rule—the smallest volume that meets the rule is 16 cubic feet.