To calculate the perimeter of a rectangle, you can use the formula:
\[ \text{Perimeter} = 2 \times (\text{length} + \text{width}) \]
In this case, the length is 16 units and the width is 9 units. So, we can substitute these values into the formula:
\[ \text{Perimeter} = 2 \times (16 + 9) = 2 \times 25 = 50 \text{ units} \]
Therefore, the perimeter of the Zoom background is 50 units.