Silent, quiet and enclosed are useful search terms, but a buyer should ask what the description means for the exact model.
Request measured noise information, test conditions, distance, operating load and the enclosure configuration. Confirm ventilation, access, control panel, fuel tank and service points. Do not treat a marketing label as a certified noise result.
Also confirm whether the image matches the model, whether the enclosure is standard or optional, and which documents are available for the destination market. These questions help separate a genuine configuration from a generic product category label.