The 3D model of the fireplace was made based on the project of Michael Hsu - "8vc-headquarters"

The objects are grouped and have logical names.
To change the color from black (by default) to metallic, you need to change the object ID Michael Hsu_Bio-fireplace_Base_ from 1 to 2. Or swap the materials in the "Base_" material.
The model of the "body" of the fireplace is made for smoothing (on the Turbosmooth render with 2 iterations)
The modifier stack is not collapsed.

For Corona render, it is recommended to install a version not lower than 1.5, since the glossiness of materials is adjusted taking into account PBR.

For those who work in VRay versions below 3.1, be careful, there is a Microfaset GTR (GGX) in the materials in the BRDF section, if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward, whichever you prefer.

The archive contains versions of 3ds max 2017 and 2021 (Vray 5 and Corona 5) and separate libraries of materials for each rendering engine.

The archive contains FBX (V-Ray and Corona) and OBJ formats - without the Turbosmooth modifier!

link - https://hsuoffice.com/catalogue/8vc-headquarters/ 
Stove stove firebox campfire