1. What is CFM per Ton?

CFM per Ton is a standard measurement in HVAC (Heating, Ventilation, and Air Conditioning) that represents the amount of airflow (in cubic feet per minute) required per ton of cooling capacity. The industry standard is 400 CFM per ton of cooling.

2. How Does the Calculator Work?

The calculator uses the standard HVAC formula:

Where:

• \( CFM \) — Cubic Feet per Minute (airflow)
• \( Tons \) — Cooling capacity in tons
• \( 400 \) — Standard CFM per ton ratio

Explanation: This calculation ensures proper airflow for efficient heat exchange and optimal system performance.

3. Importance of Proper Airflow Calculation

Details: Correct CFM per ton calculation is essential for proper HVAC system design, ensuring adequate cooling, maintaining energy efficiency, preventing equipment damage, and providing optimal comfort.

4. Using the Calculator

Tips: Enter the cooling capacity in tons. The calculator will determine the required airflow in CFM based on the standard 400 CFM per ton ratio.

5. Frequently Asked Questions (FAQ)

Q1: Why is 400 CFM per ton the standard?
A: 400 CFM per ton provides the optimal balance between humidity removal, energy efficiency, and equipment performance for most standard HVAC applications.

Q2: When might a different CFM per ton ratio be used?
A: In humid climates, lower CFM (350-375) may be used for better dehumidification. In dry climates, higher CFM (up to 450) might be appropriate.

Q3: How does incorrect CFM affect system performance?
A: Too low CFM can cause freezing coils and poor humidity control. Too high CFM can reduce dehumidification and cause comfort issues.

Q4: Does this calculation apply to heat pumps as well?
A: Yes, the 400 CFM per ton standard applies to both air conditioning systems and heat pumps in cooling mode.

Q5: How is this related to duct sizing?
A: The calculated CFM determines the required duct size to deliver proper airflow throughout the system without excessive static pressure.