Type II hood materials shall be constructed of which combination?

Type II hood materials shall be constructed of which combination?

• A. Stainless steel not less than No. 24 gauge
• B. Copper sheets weighing not less than 24 ounces per square foot
• C. Galvanized steel not less than 22 gauge
• D. Stainless steel not less than No. 24 gauge and copper sheets weighing not less than 24 ounces per square foot apply

Answer: (D)

Type II hoods are designed for moisture-heavy, non-grease applications, so they must be built from corrosion-resistant materials. The code allows using stainless steel at least 24 gauge, or copper at least 24 ounces per square foot, and it also permits a combination of both materials in the same hood. Using a combination lets you mix materials in different parts of the hood as needed, as long as each portion meets its minimum thickness or weight. That flexibility is why the option describing a combination of stainless steel (not less than 24 gauge) and copper (not less than 24 oz/ft²) applies is the best choice. The single-material options don’t reflect this allowed combination.

Type II hoods are designed for moisture-heavy, non-grease applications, so they must be built from corrosion-resistant materials. The code allows using stainless steel at least 24 gauge, or copper at least 24 ounces per square foot, and it also permits a combination of both materials in the same hood. Using a combination lets you mix materials in different parts of the hood as needed, as long as each portion meets its minimum thickness or weight. That flexibility is why the option describing a combination of stainless steel (not less than 24 gauge) and copper (not less than 24 oz/ft²) applies is the best choice. The single-material options don’t reflect this allowed combination.