Static field route #19636

What do I do when a high-velocity intake louver pulls wind-driven rain into the plenum?

Airflow/TAB Impacts From Installation⚠️ CHECK FIRSTField answer expansion

📖 Verified core answer

High face velocity may need a storm/wind-driven-rain louver, not a basic weather grille. Verify the louver selection against airflow and rain performance requirements.

Open in Field Rescue Open category

Field verification checklist

Look for water past the louver blades, in filters, or in the plenum.
Check the louver model/submittal against face velocity and rain performance.
Confirm whether the blade style is drainable/storm-rated.
Make sure weeps and sill pan are open.
Escalate selection mismatch before repeated water damage occurs.

Ask foreman

The intake louver at [location] is pulling rain into the plenum under fan operation. I checked the weeps and seal; this may be a louver selection/face velocity issue. Do you want the submittal reviewed?

Text to foreman

Route options

A Correct it only if the fix is within your assignment and approved method.

B Hold and document if it affects water intrusion, weatherproofing, rated assemblies, structural anchorage, controls, TAB, or another trade.

C Bring the foreman/detailer the location, what you checked, and what decision you need before sealing, testing, cover, or startup.

Do not do this

Do not blame only caulk when the actual issue is louver selection versus intake velocity/weather exposure.

Why this matters

Wrong louver selection can soak filters, damage equipment, and flood the intake plenum.

Final verification

Use this as field training guidance. Final direction still comes from the foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, pressure/material schedule, and AHJ/code requirements.

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