1. What is CFH Calculation?

CFH (Cubic Feet per Hour) calculation approximates the cubic feet per hour of natural gas from BTU demand. This conversion is essential for sizing gas lines, appliances, and understanding gas consumption rates.

2. How Does the Calculator Work?

The calculator uses the CFH formula:

Where:

• \( CFH \) — Cubic Feet per Hour of natural gas
• \( BTU \) — British Thermal Units per hour

Explanation: The formula converts BTU demand to cubic feet of natural gas per hour, based on the approximate energy content of natural gas (1000 BTU per cubic foot).

3. Importance of CFH Calculation

Details: Accurate CFH calculation is crucial for proper gas line sizing, appliance installation, safety compliance, and energy consumption planning in residential and commercial applications.

4. Using the Calculator

Tips: Enter BTU value in BTU/h. The value must be positive and valid. The calculator will automatically compute the corresponding CFH value.

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 1000 in the formula?
A: Natural gas typically contains approximately 1000 BTU per cubic foot, making this a standard conversion factor for most applications.

Q2: Is this conversion accurate for all types of natural gas?
A: While 1000 BTU/cubic foot is a common average, actual energy content can vary by region and gas composition (typically 950-1150 BTU/cubic foot).

Q3: When is CFH calculation most important?
A: Essential for gas line sizing, appliance installation, ensuring adequate gas supply, and compliance with building codes and safety standards.

Q4: Can this be used for propane or other gases?
A: No, this formula is specific to natural gas. Other gases have different energy densities and require different conversion factors.

Q5: What are typical CFH requirements for common appliances?
A: Furnaces: 50-200 CFH, Water heaters: 30-100 CFH, Ranges: 25-65 CFH, depending on BTU ratings and specific models.