For exemption, which pair must not be exceeded for unprotected pockets?

For exemption, which pair must not be exceeded for unprotected pockets?

• A. 50 ft3 and 6 in
• B. 100 ft3 and 12 in
• C. 150 ft3 and 18 in
• D. 200 ft3 and 24 in

Answer: (B)

In NFPA 13R, small unprotected pockets can be exempt from comprehensive hydraulic calculations, but only if they stay within defined limits: the pocket’s volume must not exceed 100 cubic feet and its depth must not exceed 12 inches. Both limits must be respected for the exemption to apply, meaning you must not exceed these values. The pair that represents these maximum allowable limits is 100 ft3 and 12 inches. If the pocket is larger than either limit, the exemption doesn’t apply and the pocket’s area must be treated in the hydraulic calculations. The other options show smaller values that are still within the limit, but they do not define the threshold that determines when the exemption applies.

In NFPA 13R, small unprotected pockets can be exempt from comprehensive hydraulic calculations, but only if they stay within defined limits: the pocket’s volume must not exceed 100 cubic feet and its depth must not exceed 12 inches. Both limits must be respected for the exemption to apply, meaning you must not exceed these values.

The pair that represents these maximum allowable limits is 100 ft3 and 12 inches. If the pocket is larger than either limit, the exemption doesn’t apply and the pocket’s area must be treated in the hydraulic calculations. The other options show smaller values that are still within the limit, but they do not define the threshold that determines when the exemption applies.