How many AFDs rated at 1800 CFM are needed to produce 6 air changes per hour in a 150 x 60 x 11 foot structure?

How many AFDs rated at 1800 CFM are needed to produce 6 air changes per hour in a 150 x 60 x 11 foot structure?

• A. 4
• B. 5
• C. 6
• D. 3

Answer: (C)

To determine the number of Air Filtration Devices (AFDs) required to achieve 6 air changes per hour in a given space, we first need to calculate the total volume of the structure and then figure out the airflow required to achieve the desired air changes. 1. **Calculate the Volume of the Structure**: The volume is determined by multiplying the length, width, and height of the space. In this case, the dimensions are 150 feet (length) x 60 feet (width) x 11 feet (height). \[ \text{Volume} = 150 \, \text{ft} \times 60 \, \text{ft} \times 11 \, \text{ft} = 99,000 \, \text{cubic feet} \] 2. **Determine the Required Airflow for 6 Air Changes per Hour**: To calculate the airflow needed in cubic feet per minute (CFM), we need to use the formula: \[ \text{Airflow (CFM)} = \frac{\text{Volume} \times \text{Air Changes per Hour}}{60} \] Substituting the volume and

To determine the number of Air Filtration Devices (AFDs) required to achieve 6 air changes per hour in a given space, we first need to calculate the total volume of the structure and then figure out the airflow required to achieve the desired air changes.

1. Calculate the Volume of the Structure:

The volume is determined by multiplying the length, width, and height of the space. In this case, the dimensions are 150 feet (length) x 60 feet (width) x 11 feet (height).

[

\text{Volume} = 150 , \text{ft} \times 60 , \text{ft} \times 11 , \text{ft} = 99,000 , \text{cubic feet}

]

2. Determine the Required Airflow for 6 Air Changes per Hour:

To calculate the airflow needed in cubic feet per minute (CFM), we need to use the formula:

[

\text{Airflow (CFM)} = \frac{\text{Volume} \times \text{Air Changes per Hour}}{60}

]

Substituting the volume and