Insect screening and integrated pest management
Exclusion is cheaper than chemistry, but every screen changes the airflow.
Mesh size follows the pest
Thrips need a finer mesh than whitefly; finer mesh costs more air. The mesh choice is a pest-pressure decision, then a ventilation redesign.
Airflow compensation
A 40-mesh screen can cut airflow by half. Vent area, fan capacity and cooling must be re-sized with the screen installed, not after.
Door discipline
Most infestations enter through doors and crates, not vents. Airlocks, double doors and a crate pass-through are design details, not housekeeping.
Monitoring
Sticky traps and weekly scouting make the screen worth its cost; without monitoring, exclusion is an assumption.
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