Door return mechanisms RYOBI D-2150BC JAPAN door spring return mechanism for fire-resistant doors Branded Japanese Ryobi automatic door closing spring return mechanism of top-quality construction and performance.Features adjustable force and backcheck function for safety purposes.Operates reliably down to -20°C.Certified fire-resistant.Adjustable and suitable for entrance doors made of aluminum, PVC, wood, and steel, for door leaf widths up to 125 cm. View