1. What Is Combustion Air Calculation?

Combustion air calculation determines the amount of air required for proper combustion of natural gas appliances. Adequate air supply ensures efficient burning, prevents incomplete combustion, and maintains safe operation of heating equipment.

2. How Does The Calculator Work?

The calculator uses the combustion air formula:

Where:

• \( Air \) — Combustion air requirement in cubic feet per hour (CFH)
• \( BTU \) — British Thermal Units per hour (BTU/hr)
• \( 9.57 \) — Conversion factor for natural gas
• \( 1000 \) — Scaling factor

Example: A 100,000 BTU furnace requires approximately 957 CFH of combustion air.

3. Importance Of Proper Combustion Air

Details: Proper combustion air is essential for appliance efficiency, safety, and longevity. Insufficient air can lead to carbon monoxide production, reduced efficiency, and potential equipment damage.

4. Using The Calculator

Tips: Enter the BTU rating of your appliance in BTU/hr. The calculator will determine the required combustion air in cubic feet per hour (CFH). Ensure accurate BTU input for reliable results.

5. Frequently Asked Questions (FAQ)

Q1: Why is combustion air important for gas appliances?
A: Combustion air provides the oxygen needed for complete fuel burning, preventing dangerous conditions like carbon monoxide production and ensuring optimal appliance performance.

Q2: What happens with insufficient combustion air?
A: Insufficient air causes incomplete combustion, leading to carbon monoxide production, sooting, reduced efficiency, and potential appliance shutdown or damage.

Q3: Does this calculation apply to all fuel types?
A: This specific formula is for natural gas. Other fuels like propane or oil have different air requirements and conversion factors.

Q4: How do I ensure adequate combustion air in confined spaces?
A: Follow local building codes which typically require specific ventilation openings or mechanical air supply systems for confined appliance installations.

Q5: Can outdoor air be used for combustion?
A: Yes, direct vent systems use outdoor air specifically for combustion, which is often recommended for improved safety and efficiency.