Sibir-20 oven:
490 x 780 x H 790 mm
https://www.ozon.ru/product/pech-bannaya-chugunnaya-sibir-20-panoramnaya-dvertsa-setka-vysechka-1242266907/?at=nRtrVLynMCp9rMzrUD3qjg2u8GNgZzSL1G093iXlZ4l8 

Without Turbosmooth modifier:
Polys: 341,619
Verts: 339,563
With Turbosmooth iterations 1 modifier:
Polys: 1,377,584
Verts: 780 989

The Turbosmooth modifier with Isoline Display was applied to the required objects;
There is an FBX file (if necessary, apply the Turn To Poly modifier to the FBX file);
For Corona render, it is recommended to install version no lower than 1.5, since the glossiness of materials is configured taking into account PBR.