For hood construction, the required minimum thickness is not less than 18 MSG for steel and not less than 20 MSG for stainless steel. Which option correctly states this?

For hood construction, the required minimum thickness is not less than 18 MSG for steel and not less than 20 MSG for stainless steel. Which option correctly states this?

• A. 16 MSG and 18 MSG
• B. 14 MSG and 16 MSG
• C. 20 MSG and 22 MSG
• D. 18 MSG and 20 MSG

Answer: (D)

The main idea is knowing the minimum hood thickness specified for materials. NFPA 96/17A requires not less than 18 MSG for steel and not less than 20 MSG for stainless steel, meaning those are the lowest acceptable gauges. The correct statement matches these exact minimum values: steel must be at least 18 MSG and stainless steel at least 20 MSG. Options that are thinner than these requirements fail to meet the standard, while an option that uses thicker gauges (like 20 and 22) technically satisfies the requirement but does not state the minimums themselves.

The main idea is knowing the minimum hood thickness specified for materials. NFPA 96/17A requires not less than 18 MSG for steel and not less than 20 MSG for stainless steel, meaning those are the lowest acceptable gauges. The correct statement matches these exact minimum values: steel must be at least 18 MSG and stainless steel at least 20 MSG. Options that are thinner than these requirements fail to meet the standard, while an option that uses thicker gauges (like 20 and 22) technically satisfies the requirement but does not state the minimums themselves.