Patent ID: 7779961

Claim:
A diesel engine vehicle having a passenger area surrounded by walls and covered by a roof, a chamber inside the walls and partitioned from the passenger area, and a heat-emitting exhaust treatment unit having an outlet extending upwardly inside the chamber, and a diffuser having a hollow body having a proximal end, and a distal end oriented at least partially toward a forward direction of the vehicle relative to the proximal end, a diffuser inlet at the proximal end being connected to an exhaust pipe of the exhaust treatment unit, and a flat outlet grate extending above the hollow body of the diffuser, between the proximal end and the distal end, and oriented parallel to and positioned flush with a surrounding portion of the roof, the flat outlet grate forming a diffuser outlet leading out from the roof of the vehicle, the flat outlet grate also comprising vanes oriented at least partially toward a rear direction of the vehicle; further comprising a closure pivotally mounted within the hollow body, the closure being pivotally biased towards a closed position, against the inlet, the closure being pivotable into an open position, against the bias, by a force exerted by exhausting gasses.