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Deep vein thrombosis (DVT) occurs when a blood clot forms in a deep vein in the leg or arm. There are two types of veins in the leg: superficial veins which lie just below the skin and can be seen on the surface, and deep veins which lie deep within the leg muscles.
The VVT System VVT stands for variable volume and temperature. VVT is provided with a complete factory-packaged control system designed to provide multiple zones of temperature control using a low cost, single zone, constant volume heating and cooling packaged rooftop unit, VPAC, or split sys-tem.he VVT System VVT stands for variable volume and temperature. VVT is provided with a complete factory-packaged control system designed to provide multiple zones of temperature control using a low cost, single zone, constant volume heating and cooling packaged rooftop unit, VPAC, or split sys-tem.