A set of internal (intra-apartment / intra-house) recuperator units.
The scene contains the following models of recuperators:

Aspira ASPIRVELO AP
Overall dimensions of the model:
Height - 180mm
Width - 180mm
Depth - 48mm

Aspira ASPIRVELO 2.0 SMART WI-FI
Overall dimensions of the model:
Height - 250mm
Width - 260mm
Depth - 50mm

Royal Clima FIATO RCF-70
Overall dimensions of the model:
Height - 206mm
Width - 206mm
Depth - 50mm

Winzel Expert WiFi RW1-50 P
Overall dimensions of the model:
Height - 280mm
Width - 230mm
Depth - 65mm

VENTini HRV-60-PLUS
Overall dimensions of the model:
Height - 280mm
Width - 280mm
Depth - 60mm

AWENTA HRV100P
Overall dimensions of the model:
Height - 190mm
Width - 190mm
Depth - 20mm

The archive contains a 3ds max 2017 scene for Corona + obj and mtl files.

Renders for the preview were made in Corona Render 8. The model uses Corona Legacy Mtl materials.
In the stack, the Turbosmooth modifier during rendering is 2 iterations (geometry for smoothing).
Adjust the degree of smoothing as needed.

https://www.vseinstrumenti.ru/category/rekuperatory-13218/