PVC Strip Curtains prevents flying insects from infiltrating a facility and actually repels them away from the door opening. Insects are naturally drawn toward heat and light. The PVC strip provides a thermal barrier, which prevents the insect from sensing the heat coming from inside the facility, by providing a thermal barrier. At the same time, the yellow pigment inhibits their ability to see light beyond the PVC strip itself. To an insect, this product is opaque due to the pigment.