Superior protection against bugs
 
Bug Blocker is protection round net filter with the function of bug barrier in your dutching system: this handy product offers superior protection against bugs while having a minimal restriction on airflow. The plastic mesh bug screen easily slips on and off fans and ducting. Elasticised opening and adjustable drawstring create a perfect fit. Catches insects, mould and mildew. Use for intake or exhaust. Mildew and UV resistant, washable.