1. What is Fan Efficiency Grade?

Fan Efficiency Grade (FEG) is a rating system that measures the efficiency of fans in converting electrical power into useful air movement. It provides a standardized way to compare fan performance across different types and sizes.

2. How Does the Calculator Work?

The calculator uses the FEG formula:

Where:

• Efficiency — Fan efficiency percentage (%)

Explanation: The equation calculates the fan efficiency grade based on the input efficiency percentage.

3. Importance of FEG Calculation

Details: Calculating FEG is important for evaluating fan performance, energy consumption, and selecting the most efficient fans for specific applications to reduce operating costs.

4. Using the Calculator

Tips: Enter fan efficiency percentage. The value must be valid (efficiency > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a good FEG rating?
A: Higher FEG ratings indicate more efficient fans. Ratings above 70 are generally considered good, with the most efficient fans reaching 85+.

Q2: How is FEG different from other efficiency metrics?
A: FEG provides a standardized grading system that allows for easy comparison between different fan types and sizes, unlike manufacturer-specific efficiency ratings.

Q3: What factors affect fan efficiency?
A: Blade design, motor efficiency, system resistance, and operating conditions all significantly impact fan efficiency and the resulting FEG rating.

Q4: Are there different FEG standards for different fan types?
A: Yes, FEG calculations may vary slightly between centrifugal, axial, and other fan types to account for their different performance characteristics.

Q5: How often should FEG be calculated?
A: FEG should be calculated when selecting new fans and periodically for existing systems to monitor performance degradation over time.