A reminder to all:

   You can perform a quick & dirty burner box "cleaning" by removing
the outer vent cover,stick a vac to the exposed exhaust pipe.  When I
perform this "maintenance", I generally remove the drain tube cover
inside the van to make sure it's not plugged.   (you should hear air
rushing into it)

  If you want access to both the intake & exhaust, you'll have to
remove the rest of the exhaust cover parts, but you have to be careful
upon reassembly, because when you don't get that good seal, then the
flame will probably blow out whilst going down the road with the
windows down.

   I use a wireless indoor outdoor thermometer to monitor what's going
on inside the box, and have installed two switched muffin fans.  One's
a mini, sitting on top of the coils to insure good airflow inside the
box, the other, a replacement for the original in the back.

George/ATL