1. What is CFH Calculation?

CFH (Cubic Feet per Hour) calculation converts BTUs to CFH using the BTU per cubic foot value. This is commonly used in HVAC and gas flow calculations to determine the volume of gas needed to produce a specific amount of heat.

2. How Does the Calculator Work?

The calculator uses the CFH formula:

Where:

• \( BTU \) — British Thermal Units
• \( BTU \text{ per } cf \) — BTU per cubic foot of gas

Explanation: The formula divides the total BTU value by the BTU content per cubic foot of gas to determine the cubic feet per hour required.

3. Importance of CFH Calculation

Details: Accurate CFH calculation is essential for proper sizing of gas lines, regulators, and appliances to ensure efficient and safe operation of gas-fired equipment.

4. Using the Calculator

Tips: Enter BTU value and BTU per cubic foot value. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical BTU per cf value for natural gas?
A: Natural gas typically contains about 1,000-1,050 BTU per cubic foot, but this can vary by location and gas composition.

Q2: Why is CFH important in HVAC systems?
A: CFH helps determine the correct gas flow rate needed for heating appliances to operate at their specified BTU output.

Q3: Can this calculator be used for propane gas?
A: Yes, but note that propane has a higher BTU content (approximately 2,500 BTU per cubic foot).

Q4: How does altitude affect CFH calculations?
A: At higher altitudes, gas expands and contains less energy per cubic foot, which may require adjustment of BTU per cf values.

Q5: Is CFH the same as SCFH?
A: No, SCFH (Standard Cubic Feet per Hour) is measured at standard temperature and pressure conditions, while CFH may be measured at actual conditions.