Plastic ShuttersShutter made of heavy duty, durable twin wall profile frame for longer life and stability. Individual patented clips allow for expansion and contraction while reducing air leakage and light. Increased fan efficiency with 21. 8% more airflow and 17. 1% less air leakage compared with standard PVC shutters. A rubber seal on the bottom of each blade ensures a tighter seal. The blades pivot on a continuous fiber rod. The design makes it impossible for