What size opening is needed for a grill rated at 75% free area if a Free Air Opening of 152 Square Inches is required?

To determine the required size opening for a grill that has a 75% free area when a Free Air Opening of 152 square inches is needed, it's essential to understand the relationship between the free area and the total area of the grill.

The formula to find the required size of the opening can be expressed as follows:

Required Size of Opening = Free Air Opening / Free Area Percentage

Given that the Free Air Opening is 152 square inches and the free area percentage is 75% (or 0.75), the calculation is:

Required Size of Opening = 152 square inches / 0.75 = 202.67 square inches

When rounded to the nearest whole number, this amount would be approximately 203 square inches. Thus, selecting 203 square inches as the appropriate size opening aligns perfectly with the mathematical valuation derived from the given parameters.

This choice reflects an understanding of how free area percentages are applied in practical scenarios, ensuring that there is enough area for gas to pass through efficiently while meeting safety and operational standards.