This specific 3D model, "Curtain Low-poly 3D model 104", 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: 9.48 MB), GLTF (glTF, filesize: 7.69 MB), BLEND (Blender, filesize: 8.77 MB), FBX (Autodesk FBX, filesize: 9.93 MB)