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There is a need for a compact and high capacity HVAC system for a vehicle cab. This need is met by a roof enclosed HVAC system. The system includes a roof upper panel, a roof lower panel, a fresh air duct communicated with a fresh air inlet exposed to an exterior of the cab, a recirculation air duct

There is a need for a compact and high capacity HVAC system for a vehicle cab. This need is met by a roof enclosed HVAC system. The system includes a roof upper panel, a roof lower panel, a fresh air duct communicated with a fresh air inlet exposed to an exterior of the cab, a recirculation air duct communicated with a recirculation air inlet exposed to an interior of the cab, and a conditioned air duct communicated with an air outlet exposed to the interior of the cab. An HVAC unit is mounted between the roof upper and lower panels. The HVAC unit includes a fan unit, a heater unit and an evaporator unit. The heater and evaporator units are concentrically arranged around and surrounding the fan unit. The fan unit draws air from the fresh air duct and the recirculation air duct and blows air through the heater unit and an evaporator unit and into conditioned air ducts

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I claim: 1. A roof enclosed HVAC system for a vehicle cab, comprising: a roof upper panel; a roof lower panel; a fresh air duct communicated with a fresh air inlet exposed to an exterior of the cab; a recirculation air duct communicated with a recirculation air inlet exposed to an interior of the c

I claim: 1. A roof enclosed HVAC system for a vehicle cab, comprising: a roof upper panel; a roof lower panel; a fresh air duct communicated with a fresh air inlet exposed to an exterior of the cab; a recirculation air duct communicated with a recirculation air inlet exposed to an interior of the cab; a conditioned air duct communicated with an air outlet exposed to the interior of the cab; an HVAC unit mounted between the roof upper and lower panels, the HVAC unit comprising a fan unit, a heater unit and an evaporator unit, the heater and evaporator units being concentrically arranged around and surrounding the fan unit; the fan unit comprising an annular impeller driven by a motor mounted in the center of the impeller, the impeller having an annular upper wall, an annular lower wall surrounding an inlet chamber, and a plurality of impeller blades extending between the upper and lower walls, the blades forcing air radially outwardly upon rotation of the fan unit, the fresh air duct and the recirculation air duct being communicated with the inlet chamber, and the conditioned air duct receiving air forced outwardly by the fan unit through the heater unit and the evaporator unit; the roof lower panel having a central opening therein, and the fan unit is positioned adjacent said central opening; a cover panel is mounted adjacent to the central opening, and an outer portion of the cover panel and an inner portion of the roof lower panel forming a portion of the recirculation duct; and a recirculation filter is mounted in the recirculation duct between the cover panel and the roof lower panel. 2. The HVAC system of claim 1, wherein: the cover panel covers the central opening, and is spaced apart from the roof lower panel. 3. The HVAC system of claim 2, wherein: the recirculation filter is annular. 4. The HVAC system of claim 1, further comprising: a roof inner panel located between the roof upper and lower panels, the roof inner panel and a portion of the roof lower panel forming a portion of the fresh air duct. 5. A roof enclosed HVAC system for a vehicle cab, comprising: a roof upper panel; a roof lower panel; a fresh air duct communicated with a fresh air inlet exposed to an exterior of the cab; a recirculation air duct communicated with a recirculation air inlet exposed to an interior of the cab; a conditioned air duct communicated with an air outlet exposed to the interior of the cab; an HVAC unit mounted between the roof upper and lower panels; the roof lower panel having a central opening therein, and the HVAC unit is positioned adjacent said central opening; a cover panel mounted below adjacent to the central opening and spaced apart from the roof lower panel, and an outer portion of the cover panel and an inner portion of the roof lower panel forming a portion of the recirculation duct; and an annular recirculation filter mounted in the recirculation duct between the cover panel and the roof lower panel.