Abstract: A tractor cab has a floor (12) at least part of which is of a double layer construction having an upper layer (12a) and a lower layer (12b) spaced vertically below the upper layer to define a cavity (29,30) between the layers. The cavity being used for a) the passage of air associated with heating, ventilating, demisting or air conditioning the cab and/or b) the passage of electrical wiring or hydraulic pipes and hoses and/or c) the storage of fluids or other materials or equipment. Part of the floor supports an HVAC unit (11) whose output is directed between the upper and lower layers. The upper layer (12a) includes output apertures (27a, 28a) through which air from the HVAC unit can be discharged or recirculated.

Abstract: A tractor cab has a floor (12) at least part of which is of a double layer construction having an upper layer (12a) and a lower layer (12b) spaced vertically below the upper layer to define a cavity (29,30) between the layers. The cavity being used for a) the passage of air associated with heating, ventilating, demisting or air conditioning the cab and/or b) the passage of electrical wiring or hydraulic pipes and hoses and/or c) the storage of fluids or other materials or equipment. Part of the floor supports an HVAC unit (11) whose output is directed between the upper and lower layers. The upper layer (12a) includes output apertures (27a, 28a) through which air from the HVAC unit can be discharged or recirculated.