Static field route #19637

What do I do when a clogged bird screen makes the intake louver collapse inward?

Equipment Connections: RTU, AHU, VAV, Fans & Louvers🛑 STOP / GET DIRECTIONField answer expansion

📖 Verified core answer

A blocked screen can make the fan pull hard against the louver. Shut the fan down, clear/replace the screen and damaged louver, and review maintenance or pressure safety controls.

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Field verification checklist

Check screen condition before startup and during seasonal debris periods.
Look for blade deformation, frame bowing, or suction noise.
Confirm the fan is not running against a blocked intake.
Document debris and louver damage.
Ask about screen maintenance and pressure safety controls.

Ask foreman

The intake louver at [location] collapsed inward after the bird screen clogged with debris. I shut down/held startup and documented the blockage. Do you want replacement louver sections and pressure/screen maintenance review?

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 run a large supply fan against a blocked intake screen and hope it clears itself.

Why this matters

Blocked intakes can damage the louver, starve the system, and create building pressure problems.

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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