road vehicle ventilation

INRS has evaluated the performance of fume extraction systems on road pavement asphalt pavers over a two year period between 2009 and 2011. These systems are used to reduce operator exposure by capturing fumes at the auger, where most emissions are generated, and discharging them above the paver at sufficient velocity to prevent fumes blowing back towards the operator cab. Evaluation was conducted using a tracer gas (SF6), based on the NIOSH-proposed protocol (1997).