"Bubba" wrote in message

A motor, blowing the system clear?
Ransley. Where do you come up with these terms?
I believe you are talking about a Draft Inducer venter motor. It
doesnt blow. It provides a negative pressure inside the heat
exchanger.
Is it a Tempstar, Keeprite, Heil, ICP furnace?
How about a model and serial number?
Bubba

I don't know about the draft inducer on a home heater, but I do know a
little about some gas fired boilers. Why is a negative pressure needed?

I'm licensed to operate high pressure steam boilers up to 300 horsepower.
Any time the boiler is started, the blower comes on and there is a purge
cycle. This is to clear the boiler and stack of any unburned gasses that
may be in there. On modern equipment this is programmed into the
controller, but on older systems it was done manually. Maybe Ransly knows
about some home models that are similar.