1. What is BTU to CFH Conversion?

The BTU to CFH conversion calculates the cubic feet per hour (CFH) of natural gas required to produce a specific heat output in British Thermal Units per hour (BTU/h). This is essential for sizing gas lines and appliances in heating systems.

2. How Does the Calculator Work?

The calculator uses the CFH formula:

Where:

• \( CFH \) — Cubic feet per hour (ft³/h)
• \( BTU/h \) — Heat rate in British Thermal Units per hour
• \( BTU\ per\ ft³ \) — Energy content of natural gas (typically 1020 BTU/ft³)

Explanation: The formula divides the total heat output required by the energy content of the gas to determine the volume flow rate needed.

3. Importance of Gas Flow Calculation

Details: Accurate CFH calculation is crucial for proper sizing of gas pipes, regulators, and appliances to ensure efficient and safe operation of heating systems.

4. Using the Calculator

Tips: Enter the required heat output in BTU/h and the energy content of your natural gas (default is 1020 BTU/ft³ for standard natural gas). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the standard BTU content for natural gas?
A: Standard natural gas typically contains about 1020-1070 BTU per cubic foot, with 1020 BTU/ft³ being a common average value.

Q2: Why is CFH calculation important for gas systems?
A: Proper CFH calculation ensures gas lines are sized correctly to deliver adequate fuel to appliances without pressure drops or safety issues.

Q3: How does altitude affect BTU content?
A: At higher altitudes, natural gas may have slightly lower BTU content due to lower atmospheric pressure.

Q4: Can this calculator be used for propane?
A: No, propane has a different energy content (approximately 2500 BTU/ft³). Use propane-specific calculators for accurate results.

Q5: What factors affect gas flow requirements?
A: Appliance efficiency, pipe length, number of fittings, elevation changes, and local gas pressure all affect actual flow requirements.