This specific 3D model, "Interior Doors Premium low poly 3d model Low-poly 3D model 2", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
Usage of this 3d asset is subject to the "Unknown license" agreement.
OBJ (OBJ, filesize: 979 KB), MAX (Autodesk 3ds Max, filesize: 979 KB), FBX (Autodesk FBX, filesize: 979 KB)