The effective venting area for smoke and heat venting must be at least 16 sq ft, with no dimension less than:

The effective venting area for smoke and heat venting must be at least 16 sq ft, with no dimension less than:

• A. 2 ft
• B. 3 ft
• C. 4 ft
• D. 6 ft

Answer: (C)

Smoke and heat venting needs a opening large enough to move heat and smoke out effectively, plus a restriction that the opening isn’t too narrow. The vent area must be at least 16 square feet, and the smallest dimension of the opening cannot be less than four feet. That means the minimum opening that satisfies both conditions is 4 ft by 4 ft, which equals 16 ft^2. Any smaller dimension (like 2 ft or 3 ft) would violate the minimum size rule, even if the other side made the area large enough. A dimension of 6 ft would also satisfy the rule, but it isn’t the minimum allowed dimension.

Smoke and heat venting needs a opening large enough to move heat and smoke out effectively, plus a restriction that the opening isn’t too narrow. The vent area must be at least 16 square feet, and the smallest dimension of the opening cannot be less than four feet. That means the minimum opening that satisfies both conditions is 4 ft by 4 ft, which equals 16 ft^2. Any smaller dimension (like 2 ft or 3 ft) would violate the minimum size rule, even if the other side made the area large enough. A dimension of 6 ft would also satisfy the rule, but it isn’t the minimum allowed dimension.