1. What is Louver Sizing?

Louver sizing is the process of determining the appropriate free area of a louver to allow proper airflow while maintaining desired velocity. It's crucial for HVAC systems, ventilation, and architectural applications.

2. How Does the Calculator Work?

The calculator uses the louver sizing equation:

Where:

• \( CFM \) — Airflow in cubic feet per minute
• \( FPM \) — Face velocity in feet per minute
• \( 144 \) — Conversion factor (square inches per square foot)
• \( Area \) — Required louver area in square inches

Explanation: The equation calculates the necessary free area of a louver based on desired airflow and velocity requirements.

3. Importance of Proper Louver Sizing

Details: Correct louver sizing ensures adequate airflow while preventing excessive pressure drop, water penetration, or noise issues in ventilation systems.

4. Using the Calculator

Tips: Enter CFM (airflow) and FPM (desired face velocity). Both values must be positive numbers. The result shows required free area in square inches.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical FPM for louvers?
A: Standard louver velocities range from 300-500 FPM for weather protection, up to 800 FPM for high-performance applications.

Q2: How does louver free area affect sizing?
A: The calculated area is the required free area. Actual louver size will be larger based on the free area percentage of the selected louver type.

Q3: What factors affect louver performance?
A: Blade design, spacing, free area percentage, and installation conditions all impact airflow, water resistance, and pressure drop.

Q4: When should I use specialized louvers?
A: Consider storm louvers for severe weather, combination louvers for sound attenuation, or drainable louvers in wet locations.

Q5: How do I account for pressure drop?
A: For critical applications, consult manufacturer performance data as actual airflow may be less than theoretical calculations.