Single Fire Exit Door 3D model is available on CGTrader for $10. Original author: Polygate. Specs: 35228 polys, 35700 verts.
OBJ (OBJ, filesize: 603 KB), 3DS (3D Studio, filesize: 511 Bytes), MAX (Autodesk 3ds Max, filesize: 25.9 MB), FBX (Autodesk FBX, filesize: 1.14 MB), C4D (Cinema 4D, filesize: 268 KB), MA (Autodesk Maya, filesize: 739 KB)