TinnerFlow™4th YearRoof Curbs, Louvers & Exterior AirStop / get direction
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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A bird screen loaded with leaves, plastic, or debris can become the real damper in the system. A big fan can pull enough negative pressure to bend blades, collapse weak frames, or damage the intake assembly.
Stop the fan if the louver is deforming. Clear the obstruction only when safe, document damage, and replace any bent louver sections. For high-consequence intakes, review maintenance access, stronger screen/louver construction, and pressure monitoring/shutdown controls with the foreman/engineer.
Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.