Three Danfoss VLT HVAC Drive variable frequency drives (VFDs) available for sale, photographed in what appears to be a mechanical or plant room environment. All three units are from the well-known Danfoss VLT HVAC Drive series, designed specifically for HVAC applications including fans, pumps, and compressors. The drives feature the standard Danfoss graphical LCD control panel with navigation buttons including Status, Quick Menu, Main Menu, Alarm Log, and directional controls with OK confirmation. The units are finished in the characteristic light grey enclosure with black front panel fascia. All three drives appear to be in good used condition with no visible major damage, though some surface marks and minor wear are present consistent with operational use in a building services environment. The drives are wall-mounted units, and from their physical size they appear to be in the medium-to-large power range, estimated between 15kW and 45kW based on enclosure dimensions visible in photos. Each unit is accompanied by an Eaton isolator switch mounted nearby. The Danfoss VLT HVAC Drive FC102 series is highly regarded for energy-saving performance and is compatible with BMS systems via various communication protocols. These units are ideal for replacement parts, retrofit HVAC projects, pump control applications, or fan speed regulation in commercial and industrial buildings. Exact model numbers and power ratings should be verified on the unit nameplates prior to purchase.