I would call the manufacturer and ask. It might be built needing a certain amount of ventilation and require certain clearances. No one can answer this, especially when you don't mention the brand. You may be compromising your warranty, who knows.

Older residential models, (and most commercial models) vented out, the new ones vent into the living area, (I assume because it is an easier install).

You do need air movement to reduce heat buildup, keep in mind that a UL rating addresses this in its testing for the insurance companies.

If sound is he concern, 3/4 inch drywall will emulate it (use spacers or rubber strips between the drywall and the framing, if the framing contacts that oven to prevent the sound from radiating to the drywall.

You could also install a 4" electronics fan for air movement if you are so inclined. You could also use drywall over styrofoam.

But the simplest is to order the OEM product. See link below.

Hope this helps.

Here is a link that might be useful: Wall oven insulation