1. What is CFM Per Ton?

CFM Per Ton is a key measurement in HVAC (Heating, Ventilation, and Air Conditioning) that indicates the amount of airflow (in cubic feet per minute) required per ton of cooling capacity. The standard value is 400 CFM per ton, which ensures proper system performance and efficiency.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( \text{Total CFM} \) — Total airflow in cubic feet per minute
• \( \text{Tonnage} \) — Cooling capacity in tons

Explanation: This calculation helps determine if your HVAC system is providing adequate airflow for its cooling capacity.

3. Importance of CFM Per Ton Calculation

Details: Proper CFM per ton is crucial for efficient HVAC operation. Too little airflow can reduce efficiency and cause freezing, while too much can reduce dehumidification and comfort.

4. Using the Calculator

Tips: Enter the total CFM and system tonnage. Both values must be greater than zero. The calculator will determine the actual CFM per ton and compare it to the standard 400 CFM/ton.

5. Frequently Asked Questions (FAQ)

Q1: Why is 400 CFM per ton considered standard?
A: 400 CFM per ton provides the optimal balance between cooling efficiency, dehumidification, and energy consumption for most residential and commercial systems.

Q2: When might CFM per ton need to be adjusted?
A: In humid climates, lower CFM (350-375) improves dehumidification. In dry climates, higher CFM (425-450) may be acceptable.

Q3: What problems can incorrect CFM per ton cause?
A: Low CFM can cause frozen coils and poor cooling. High CFM can reduce dehumidification and cause comfort issues.

Q4: How is total CFM measured?
A: CFM is typically measured using an anemometer at supply registers or calculated from static pressure and fan curves.

Q5: Does CFM per ton apply to heating systems?
A: While the concept is primarily for cooling, airflow adjustments may be needed for heating efficiency and comfort.