CFM Calculator

The CFM Calculator is designed to calculate the required airflow, measured in cubic feet per minute (CFM), necessary for proper ventilation based on the dimensions of a room and the air changes per hour (ACH). This tool is particularly useful for HVAC contractors who need to determine appropriate airflow to maintain air quality in residential and commercial spaces.

How the CFM Calculator Works:

• Room Length: The length of the room (in feet).
• Room Width: The width of the room (in feet).
• Room Height: The height of the room (in feet).
• ACH (Air Changes per Hour): The number of times the air in the room is replaced in one hour.

Calculation Breakdown:

1. Room Area: This is the floor area of the room, calculated as: Length × Width.
2. Room Volume: This is the total volume of the room, calculated as: Length × Width × Height.
3. CFM Calculation: The required CFM is calculated using the formula: (Room Volume × ACH) / 60, which gives the amount of air (in cubic feet) that needs to be moved per minute to achieve the desired air exchange rate.

Example Use Case:

For a room that is 20 feet long, 15 feet wide, and 10 feet high, with an ACH of 6:

• Room Area: 20 × 15 = 300 sq. ft.
• Room Volume: 300 × 10 = 3000 cubic feet
• Required CFM: (3000 × 6) / 60 = 300 CFM

This means 300 cubic feet of air needs to be moved every minute to meet the air change requirements. This CFM Calculator is a valuable tool for HVAC contractors to ensure proper ventilation in different spaces.