1. What is Louver Size Calculation?

The louver size calculation determines the required area of a louver to handle a specific air flow rate at a given velocity. Proper sizing ensures adequate ventilation while maintaining desired air velocity.

2. How Does the Calculator Work?

The calculator uses the basic louver sizing equation:

Where:

• Air Flow (CFM) — Cubic Feet per Minute of air movement required
• Velocity (fpm) — Feet per Minute of air velocity through the louver

Explanation: The equation calculates the necessary louver area by dividing the total air flow by the desired air velocity.

3. Importance of Proper Louver Sizing

Details: Correct louver sizing is essential for maintaining proper ventilation rates, preventing excessive pressure drops, and ensuring system efficiency. Undersized louvers can restrict airflow while oversized louvers may allow unwanted elements to pass through.

4. Using the Calculator

Tips: Enter air flow in CFM and desired velocity in fpm. Typical velocities range from 300-800 fpm for intake louvers and 500-1200 fpm for exhaust louvers, depending on application and weather protection needs.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical velocity range for louvers?
A: Standard velocities range from 300-1200 fpm, with 500 fpm being common for general applications. Higher velocities may require special louver designs.

Q2: How does louver free area affect sizing?
A: The calculated size is the gross area. Actual louver size should account for free area percentage (typically 35-60%) by dividing the result by the free area ratio.

Q3: When should I use higher velocities?
A: Higher velocities (800-1200 fpm) are used when space is limited or for weather-protected applications, but may increase pressure drop and noise.

Q4: What factors affect louver performance?
A: Blade design, spacing, orientation, and free area percentage all impact airflow characteristics, pressure drop, and weather protection.

Q5: Should I include a safety factor?
A: It's common to add 10-20% to the calculated size to account for installation factors and future needs.