magnahelic gauge

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Why do you need it? Magnehelic guage would be used to set a barometric damper on a furnace or boiler and I've never seen or heard of anyone needing one for a pellet stove. Aren't most power vented or at least pressurized by a combustion fan? Sorry but I just don't see why you need it.
 
It could be used to check for excessive air leakage.
 
My enviro manual calls for one to measure the air from the box before the combustion fan the vacume hose from the exhaust channel. I have been looking for one but they are around 75-$100 each. With proper adjustment it will keep the flame from buring to low which will keep the cresote buildup.
 
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