Sustainable Door Openings Markar continuous hinges are part of an overall sustainable building solution. By design a continuous hinge helps to eliminate air and sound infiltration by creating a complete seal from the top to the bottom of the door at the hinge jamb. This can help to earn Indoor Environment Quality (IEQ) credits for LEED Certification. Markar hinges are a good choice for many retrofit projects. An existing door can be re-used with minimal prep work by using a Markar Continuous Edge Mounted Hinge, and Markar Pivots can help extend the life of a sagging door. When a hinge has exceeded its useful life, the steel, aluminum or stainless steel is easily recycled.