Stationary louver blades should be pitched a minimum angle of:

Stationary louver blades should be pitched a minimum angle of:

• A. 45 degrees
• B. 30 degrees
• C. 60 degrees
• D. 15 degrees

Answer: (A)

Stationary louver blades are fixed at an angle to shed water and prevent rain from entering while still allowing ventilation. Pitching them at a minimum of 45 degrees ensures water will run off the blade surface rather than pool and be driven into the opening by wind. Shallower angles (like 30 or 15 degrees) can let rain penetrate the louver, especially with wind, and can increase leakage risk. A steeper angle (such as 60 degrees) improves rain protection but reduces the available opening for air flow, diminishing ventilation efficiency. So, 45 degrees represents the practical balance: it provides reliable weather protection without overly restricting airflow, which is particularly important in wet climates like Florida.

Stationary louver blades are fixed at an angle to shed water and prevent rain from entering while still allowing ventilation. Pitching them at a minimum of 45 degrees ensures water will run off the blade surface rather than pool and be driven into the opening by wind. Shallower angles (like 30 or 15 degrees) can let rain penetrate the louver, especially with wind, and can increase leakage risk. A steeper angle (such as 60 degrees) improves rain protection but reduces the available opening for air flow, diminishing ventilation efficiency. So, 45 degrees represents the practical balance: it provides reliable weather protection without overly restricting airflow, which is particularly important in wet climates like Florida.