Posted for "Chuck Jensen" <cjensen@dts9000.com>:

 Scott,
 
 Sucking flames and smoke into the cabins on Velocity is usually not a
 problem.  In most cases, the fire just burns until the engine falls off
 (only semi-joking).  This is why many, including myself, have a fire
 detection system on the pusher that signals or alarms up front when the
 fire in back is not contained inside the six cylinders.  You tractor
 guys are lucky, you get a face full of smoke and flames, so you know
 what's going on (only semi-joking).
 
 Different smoke, for different folks.
 
 Chuck