Update on Dave's (crochunisclan) situation:
He warped the carpet plate again.
He talked to Alaska and they suspect that he has too much draft. The original owner had wired all of the controls on his triburner through a single rheostat including the PV.

He separated the PV from that wiring and has been running the PV full throttle by plugging it directly into a wall outlet. He does have a baro but it is a type "N." The baro only has the single knurled knob that I suspect moves in and out from the baro plate for its adjustment.
After consulting with Matthaus he said that Dave definitely needs to put a rheostat on the PV. Dave will be looking to hook one up capable of controlling shaded pole motors.
My suggestion to Dave was to run the rheostat at 50% and then adjust the baro to just slightly open at that speed. And he should verify the draft with a match to make sure that the baro was indeed drawing the smoke into the chimney through it.
Does this sound proper without Dave having a manometer to assist his setting ????
I also urged him to either get on the loaner list or to purchase a manometer for himself.
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Rick