GreenCircle Certifications Ceco Door is committed to reducing its environmental impacts through smarter products and advanced production methods. The results of these efforts are third-party verified to add a level of accountability to our sustainability claims. GreenCircle certification helps us tell our sustainability story while providing a benchmark for ongoing improvement. GreenCircle Certified, LLC quantifies and certifies the results of sustainbility efforts at Ceco facilities, identifying achievements in waste diversion and reductions in carbon footprint, energy demand, and water use. View our listing of GreenCircle Certifications to see details of our sustainable manufacturing practices.