Ah, yes, the oldies can be run with or w/o pipes, there are only a few
safety functions in that heater.

On 3/22/2013 12:55 PM, Bryan Feddish wrote:
>>>
> Bob is partly correct - the pipes MUST NOT be shortened, as the new Omron
> airflow sensor will detects improper airflow and shut off with an fault
> flash code. The pipes can each be extended to 2 meters total length using
> additional sections of the same type flex pipe.
> <<
>
> I have the orange 90's era Propex.  I don't think that it senses that as
> I had the exhaust tube going out the side of the van and the intake had
> no tube at all.
>
> Thanks,
> Bryan
>