ALECO Heavy-Duty Strip Doors offer 2-way visibility for safety, substantially reduce the loss of heated and cooled air, and prevent the flow of dust and contaminants from parking or loading areas. Clean-up and maintenance costs are reduced, and sound transmission is effectively lowered to help you meet OSHA requirements. Doors are made of fire-resistant, self-extinguishing PVC. Clear-Flex II® rounded edges won’t cut, non-stick additive prevents clinging. Choose either economical smooth vinyl strips for excellent visibility or Scratch-Guard® strips that have bumpers to resist scratches and abrasions—stay clearer longer. Units are shipped knocked-down with installation instructions. All strips are cut and holes punched to size. High tensile polymer MaxBullet™ HTP Fast-Mounting Hardware reduces installation and strip replacement time by 90%. To install: snap pre-punched strips over bullet shaped locks. Cross-linked polymer hardware may be mounted under any door header or to any wall. Lifetime guarantee. Made in USA.NOTE: for sidewall mount and odd size openings, order strip door larger than opening. For sizes not listed, please call to order.