Blocks for biofireplaces from the producer of Kronco.
Link to the manufacturer: https://kronco.ru/ 
Sizes: 250 mm 500 mm 800 mm 1000 mm 1200 mm 1500 mm (along the line of fire).
All fireboxes with customized flame. In the folder 3 textures of fire (diffuse + opacity) – you can choose to your liking.
For Corona render it is recommended to install a version of at least 1.5 since the glossiness of materials is configured with PBR in mind.