For a structure of dimensions 45' x 50' x 10', how many AFDs are necessary if rated at 500 CFM?

To determine how many Air Filtration Devices (AFDs) are necessary for the specified structure, it’s essential first to calculate the volume of the space to be ventilated or filtered.

The dimensions provided are 45 feet in width, 50 feet in length, and 10 feet in height. Multiplying these dimensions together, the total volume of the structure is:

Volume = Length x Width x Height

Volume = 45' x 50' x 10' = 22,500 cubic feet.

Next, we need to incorporate the airflow rating of the AFDs, which is given as 500 CFM (cubic feet per minute). To determine how many AFDs are required to adequately ventilate the entire volume, we need to look at the total airflow needed based on how quickly we want to change the air in the space.

Generally, a common standard in air filtration is to perform a complete air change typically within a certain timeframe, often around once every 20 to 30 minutes in drying scenarios. For simple calculation, let's use a 20-minute air change time:

The required airflow in CFM for one complete air change can be calculated by taking the total volume of the structure and dividing it by the